Gravity: Offline Language Learning Voice Recognition Sensor
📦 Location of the warehouse: China
Free Shipping from $50 in the US, $70 for non-continental US
- US Delivery Time: 2~7 Business days.
- Non-Continental US Delivery Time: 3~9 working days.
- Pre-Ordering: If an item is unavailable, you can pre-order it. We'll dispatch once stock is replenished, usually within 10 working days. Special pre-sale products will specify the expected arrival time in the description.
- Express Shipping: Need it faster? Contact us via email or through our live chat support, and we'll arrange expedited delivery for you.
Gravity: Offline Language Learning Voice Recognition Sensor
The Gravity Offline Language Learning Voice Recognition Sensor is an effective plug-and-play solution for speech interaction, tailored for human-computer interaction, voice assistants, smart home automation, and educational projects. It operates entirely offline without any need for an internet connection, ensuring complete data privacy and security. Fully compatible with popular development platforms such as Arduino UNO, micro:bit, and ESP32, it also includes detailed tutorials to help you get started quickly.
Key Features
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Simplified Plug-and-Play Integration: Effortlessly connects with Arduino UNO, micro:bit, and ESP32. Easy setup using I2C/UART communication protocols.
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121 Pre-Configured Voice Commands: Instantly available for use without prior setup, ideal for applications in smart homes and educational settings.
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17 User-Customizable Commands with Self-Learning: Enable the module to recognize new voice commands, accommodating any language or sound that you teach it.
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Functionality Offline: Operates without requiring an internet connection, enhancing both data privacy and utility in low-connectivity environments.
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Streamlined and Integrated Design: Features a compact design with an onboard microphone and speaker to minimize wiring and optimize space.
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Instant Voice Feedback: Receive quick audio responses immediately after command recognition for improved interaction and user engagement.
Applications
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Smart home devices controlled by voice
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Projects for educational purposes and STEM learning
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Interactions between humans and machines
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Prototyping for technology and hardware competitions
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Automated solutions for pet care and environmental monitoring
Technical Specifications
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Operating Voltage: 3.3V - 5V
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Maximum Operating Current: < 370 mA (5V)
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Communication Interface: I2C / UART
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I2C Address: 0x64
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Fixed Commands: 121
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Fixed Wake Word: 1
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Custom Commands: 17
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Learning Activation Command: 1
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Microphone Sensitivity: -28dB
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Module Dimensions: 49 × 32 mm / 1.93" × 1.26"
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Operating Temperature: 0°C to 70°C
Self-Learning Feature
This sensor features an intuitive self-learning mode. To teach it a new word or sound, activate the learning mode, speak the command three times, and it will automatically recognize and store it. It supports multilingual or even sound-based custom commands. Example use cases include:
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“Meow” – triggers a pet feeder
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“Limpia” – controls a cleaning robot (Spanish for “clean”)
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“Snap” – activates a camera
Secure Offline Usage
No data is sent to the cloud. Unlike online voice assistants, this module ensures complete user privacy and reliability in offline or restricted environments such as schools or outdoor settings.
Real-Time Feedback
Users receive instant audio or visual confirmation after issuing commands, enhancing interaction and debugging throughout development or real-world deployment.
Package Includes
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1× Gravity Offline Language Learning Voice Recognition Sensor
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1× Jumper wire set
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Access to online tutorials and documentation
Real-World Applications & Tutorials
Project: Build a Voice-Activated SOS Alert System
Discover how to create a voice-activated SOS alert system utilizing the Gravity Voice Recognition Sensor in combination with M5StickC. This project is ideal for improving safety in smart homes, particularly for elderly individuals. It showcases how voice commands can instantly send Telegram alerts in emergency situations.
Review: Exploring the Gravity Voice Recognition Module
Discover why this offline voice module is praised for its reliability and performance in automation projects. It enables seamless voice control without relying on any internet connection.
Project: Mastering Voice Commands with Arduino
Engage in an in-depth tutorial that guides you through the integration of the voice recognition sensor with Arduino. Discover how to configure custom voice commands and create dynamic, interactive projects that operate completely offline.
Project: Raspberry Pi Pico Voice Control Tutorial
Harness the capabilities of the Raspberry Pi Pico by integrating it with the Gravity Voice Recognition Sensor. This detailed guide takes you through the entire process, from setting up the hardware to designing and implementing custom voice commands for smart control applications.
Reference
1. General Shipping Information
- We provide premium shipping methods with a tracking number for each order.
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Shipping address should be input in English without any special symbols to help the courier company recognize your address in the system. We will ship according to the shipping address you provided. Please notify us of any address change before your order is marked "Shipped" to avoid parcel loss.
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Please contact our customer service staff immediately if you need to cancel or change an order. Once your order has reached "Shipped" status, it can no longer be canceled or changed in any way. To avoid complications, please recheck your shopping cart before checkout.
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We can ship all in-stock orders within 1 business day as your order has been confirmed.
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All items are inspected before dispatch and are carefully hand-packed.
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With standard courier practice, you need to check the contents of the parcel before signing for your goods. Otherwise, we will not be held responsible for any damage that may have occurred in transit.
2. Shipping Options for Orders Inside U.S.
(For Products in the U.S. Warehouse, Shenzhen Warehouse)
2.1 Shipping options for an order value under $5 inside the U.S.
Shipping Options:
| Shipping Options | Continental U.S. | Non-Continental U.S. |
|---|---|---|
|
USPS Ground Advantage |
$9.99 Arrive in 3-7 Business Days |
$9.99 Arrive in 5-9 Business Days |
|
UPS Express |
$15.99 Arrive in 2-4 Business Days |
$19.99 Arrive in 3-7 Business Days |
2.2 Shipping options for an order value between $5 and $50 inside the U.S.
Shipping Options:
| Shipping Options | Continental U.S. | Non-Continental U.S. |
|---|---|---|
|
USPS Ground Advantage |
$5.99 Arrive in 3-7 Business Days |
$7.99 Arrive in 5-9 Business Days |
|
UPS Express |
$12.99 Arrive in 2-4 Business Days |
$15.99 Arrive in 3-7 Business Days |
2.3 Free shipping options for an order value of above $50 inside the U.S.:
| Free Shipping Options | Continental U.S. | Non-Continental U.S. |
|---|---|---|
|
USPS Ground Advantage |
Free above $50 | Free above $70 |
|
UPS Express |
+ $ 9.99 for Above $50 | + $ 12.99 for Above $50 |
Important Notice:
- Before placing your order, please check the inventory location on the product page to confirm the delivery timeframes.
- For products stored in the Shenzhen warehouse, we will ship them directly from Shenzhen, China.
- If you place an order for products from both the U.S. warehouse and the Shenzhen warehouse, we will ship your order separately: the products from the Shenzhen warehouse will be sent from Shenzhen, and the products from the U.S. warehouse will be sent from the U.S. warehouse.
3. International Warehouse
Our products are stored in both our U.S. and Shenzhen warehouses to provide more flexible logistics solutions tailored to different regions and customer needs. On each product's description page, we indicate the specific warehouse location to help you better plan your purchase and delivery schedule.
3.1 U.S. Warehouse
3.2 Chinese Warehouse
We will only arrange YunExpressexpress shipping from Shenzhen for orders with products in the Shenzhen warehouse worth more than €50. Orders directly shipped from our Shenzhen warehouse are handled by YunExpress. Given the complexities of international shipping, the estimated delivery time for these packages is around 10 business days, though this may vary slightly due to customs processes or other uncontrollable factors. Otherwise, the products will first be shipped from China to our U.S. warehouse and then shipped to the final destination.
4. Customs and Taxes
4.1 How are customs handled by OpenELAB for import or export?
We aim to minimize delays and ensure compliance, but OpenELAB does not guarantee exemption from U.S. customs charges.
4.2 Are U.S. sales taxes included when the Customer places an order?
If no sales tax is charged at the time of purchase, you may still be responsible for use tax according to your state’s tax laws. OpenELAB is committed to complying with the U.S. Supreme Court's decision in South Dakota v. Wayfair, Inc. and applicable local regulations.
4.3 Are there any other fees besides tax?
Please note that international shipments to the U.S. may occasionally incur customs clearance charges or carrier-imposed fees (e.g., by DHL, FedEx, or USPS). These charges are not controlled by OpenELAB and may vary based on the delivery carrier and U.S. import classification.
Effective Date: September 16th, 2025
At OpenELAB, we are committed to providing accurate product descriptions and delivering high-quality products. If you experience any issues with your purchase, please notify us within 30 days of the shipment date.
1. Warranty Disclaimer
Unless explicitly stated in a specific agreement or purchase order, OpenELAB makes no warranties—express or implied—regarding the fitness, suitability, or merchantability of any product for a particular purpose or special use.
2. Warranty Policy
Warranty Period
The standard warranty period for products sold by OpenELAB is 12 months from the date of delivery.
Under this warranty, OpenELAB will make a reasonable effort to repair or replace products free of charge if defects are due to issues with raw materials, design, or manufacturing.
If the defect qualifies under this policy but falls outside the covered scope, reasonable charges may apply for repair or replacement.
After the warranty period, support may still be available at a reasonable fee.
Warranty Exclusions
The warranty does not apply in the following cases:
- The product is beyond the 12-month warranty period.
- Damage due to misuse, improper maintenance or storage, or failure to follow the user guide or manual.
- Issues caused by Force Majeure events (e.g., natural disasters, war, legal changes, etc.).
- Unauthorized repair attempts by the customer.
- The product is not defective but has been opened and is non-returnable by policy.
3. Returns & Refunds
If you're not satisfied with your purchase, you may be eligible for a return or exchange:
- Return for Refund: Within 15 days of receipt (unopened).
- Return for Replacement: Within 30 days of receipt (damaged or defective).
- Exchange Window: Up to 30 days from receipt.
Please email us at info@openelab.com for a return authorization before sending anything back.
Return Conditions
- Items must be in original, clean, and mint condition with packaging intact.
- Returns of damaged, used, scratched, modified, or programmed items will not be accepted.
- Include the receipt, a brief note with your name, order number, and reason for return.
Shipping & Fees
- Customers are responsible for return shipping to our warehouses in the US.
- If a return is requested due to customer reasons (e.g., change of mind, incorrect order, etc.), both the original shipping cost and the return shipping cost will be deducted from the refund amount.
- For returns due to customer reasons, we will generate and provide a return shipping label.
Payment Platform Fees
For all refunds requested due to customer reasons, a standard service fee will be deducted from the refund amount, which is charged by the payment platforms. The specific fees are as follows:
Shopify Payments: 2.9% + $ 0.3
PayPal: 4.4%
