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.
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
-
Simplified Plug-and-Play Integration: Effortlessly connects with Arduino UNO, micro:bit, and ESP32. Easy setup using I2C/UART communication protocols.
-
121 Pre-Configured Voice Commands: Instantly available for use without prior setup, ideal for applications in smart homes and educational settings.
-
17 User-Customizable Commands with Self-Learning: Enable the module to recognize new voice commands, accommodating any language or sound that you teach it.
-
Functionality Offline: Operates without requiring an internet connection, enhancing both data privacy and utility in low-connectivity environments.
-
Streamlined and Integrated Design: Features a compact design with an onboard microphone and speaker to minimize wiring and optimize space.
-
Instant Voice Feedback: Receive quick audio responses immediately after command recognition for improved interaction and user engagement.
Applications
-
Smart home devices controlled by voice
-
Projects for educational purposes and STEM learning
-
Interactions between humans and machines
-
Prototyping for technology and hardware competitions
-
Automated solutions for pet care and environmental monitoring
Technical Specifications
-
Operating Voltage: 3.3V - 5V
-
Maximum Operating Current: < 370 mA (5V)
-
Communication Interface: I2C / UART
-
I2C Address: 0x64
-
Fixed Commands: 121
-
Fixed Wake Word: 1
-
Custom Commands: 17
-
Learning Activation Command: 1
-
Microphone Sensitivity: -28dB
-
Module Dimensions: 49 × 32 mm / 1.93" × 1.26"
-
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:
-
“Meow” – triggers a pet feeder
-
“Limpia” – controls a cleaning robot (Spanish for “clean”)
-
“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
-
1× Gravity Offline Language Learning Voice Recognition Sensor
-
1× Jumper wire set
-
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.
-
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.
-
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.
-
We can ship all in-stock orders within 1 business day as your order has been confirmed.
-
All items are inspected before dispatch and are carefully hand-packed.
-
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 & Rates (United States)
(For Products in the US Warehouse & Global Warehouse)
2.1 Continental U.S. (50 States)
| Shipping Method | Order Value | Cost | Est. Delivery |
|---|---|---|---|
| USPS Ground Advantage | $0.00 - $5.00 | $9.99 | 3-7 Business Days |
| USPS Ground Advantage | $5.00 - $50.00 | $5.99 | 3-7 Business Days |
| USPS Ground Advantage | Over $50.00 | Free | 3-7 Business Days |
|
USPS Priority Mail (Faster Option) |
$0.00 - $50.00 | $19.99 | 1-4 Business Days |
| USPS Priority Mail | Over $50.00 | $17.59 | 1-4 Business Days |
2.2 Non-Continental U.S.
(Includes Alaska, Hawaii, Puerto Rico, Guam, Virgin Islands, etc.)
| Shipping Method | Order Value | Cost | Est. Delivery |
|---|---|---|---|
| USPS Ground Advantage | $0.00 - $5.00 | $9.99 | 5-9 Business Days |
| USPS Ground Advantage | $5.00 - $70.00 | $7.99 | 5-9 Business Days |
| USPS Ground Advantage | Over $70.00 | Free | 5-9 Business Days |
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 Global Warehouse (Shenzhen), we will ship them directly from China.
- If you place an order for products from both the U.S. warehouse and the Global warehouse, we will ship your order separately: the products from the Global warehouse will be sent from China, and the products from the U.S. warehouse will be sent from the U.S. warehouse.
3. Warehouse Locations
Our products are stored in both our U.S. and Global warehouses to provide more flexible logistics solutions. On each product's description page, we indicate the specific warehouse location.
3.1 U.S. Warehouse
For products stored here, we use USPS for shipping. Logistics within U.S. are very efficient, with an estimated delivery time of 3-7 business days.
3.2 Global Warehouse (China)
Located in Shenzhen, Guangdong.
For orders shipping from our Global Warehouse, we typically use YunExpress. Given the complexities of international shipping, the estimated delivery time is around 10 business days, though this may vary due to customs processes.
4. Customs and Taxes
Effective Date: December 10, 2025
At OpenELAB, we are committed to providing accurate product descriptions and high-quality electronics. The following policy outlines your rights and obligations, designed to be fair to both our customers and our business operations globally.
1. Warranty Policy
A. Standard Limited Warranty (Global & US)
For customers in the United States, Asia, and other non-EU regions:
-
Warranty Period: OpenELAB provides a 12-month warranty from the date of delivery.
-
Coverage: This warranty covers defects in material and workmanship under normal use.
-
Resolution: We will repair or replace defective units at no charge.
B. Statutory Rights for EU/UK Customers (EU Compliance)
If you are a consumer residing in the European Union or the UK purchasing from our global site:
-
Statutory Guarantee: You are entitled to a 24-month statutory guarantee for conformity defects present at the time of delivery, in accordance with EU consumer protection laws.
-
Relation: The Standard Limited Warranty (Section 1.A) applies in addition to, and does not replace, your statutory rights.
C. Warranty Exclusions (Applies to ALL Regions)
Warranty coverage is VOID if the damage is caused by:
-
Misuse: Incorrect installation, reverse polarity, or exceeding voltage limits.
-
Unauthorized Modification: This explicitly includes soldering, cutting pins, modifying the PCB, or flashing unauthorized/beta firmware that "bricks" the device.
-
Physical Damage: Drops, moisture/water damage, or electrical surges (lightning).
-
Normal Wear & Tear: Consumable parts (e.g., batteries), unless defective upon arrival.
Note: For non-warranty repairs (e.g., customer-induced damage), we may offer repair services for a fee. Shipping and diagnostic costs will be borne by the customer.
2. Return & Refund Policy
A. Return Window
-
Standard: You may request a return within 31 days of receiving your order.
-
EU Customers: You have the statutory right to withdraw from the contract within 14 days of receipt without giving a reason.
B. Refund Conditions & Restocking Fees
To protect against policy abuse, the refund amount is strictly determined by the condition of the returned item.
1. Full Refund (100%)
-
The item is Brand New, Unopened, and Unused.
-
The original packaging is intact and sealed.
-
All accessories are present.
2. Partial Refund (Restocking Fee / Value Depreciation)
If the item is returned in a condition that prevents it from being sold as new, OpenELAB reserves the right to deduct a Restocking Fee (or "Compensation for Loss of Value" for EU customers) from the refund.
Deductions apply if:
-
Signs of Use: Visible scratches, mounting marks on screw holes, or fingerprints.
-
Damaged Packaging: Original box is torn, written on, or missing.
-
Technical Modification: The device has been powered on, programmed/flashed, or soldered.
-
Broken Seals: Anti-static bags or security seals have been opened.
Depending on the severity of the usage/damage, the deduction may range from 15% to 50% of the product price. Items damaged beyond repair due to misuse will not be refunded.
C. Shipping Costs
-
Defective / Wrong Item: OpenELAB covers the return shipping cost.
-
Customer Remorse (Changed Mind / Ordered Wrong Item): The customer is responsible for all return shipping costs to our designated return center (located in the US, Germany, or China, depending on your region). Original shipping fees are non-refundable unless required by local law.
3. Return Process (RMA)
To ensure a smooth return process, please follow these steps:
-
Authorization: Contact us at info@openelab.io before returning any item. Returns without prior authorization will not be accepted.
-
RMA Number: We will provide you with a Return Merchandise Authorization (RMA) number and the correct return address.
-
Packing: Ship the item back in its original packaging with the RMA number clearly marked on the shipping label (not on the product box).
-
Tracking: We strongly recommend using a trackable shipping method. OpenELAB is not responsible for returns lost in transit.
