Gemini210 Speed Sensor IP54, Bluetooth ANT+ Bike Speedometer with 2032 Battery, 400H Battery Life

**Product Description** **Overview** This compact speed sensor is designed for cyclists who want accurate speed tracking during rides. It pairs wirelessly with your smartphone or cycling computer via Bluetooth or ANT+, delivering real-time data through compatible apps. Simple to install and operate, it’s a reliable upgrade for your bike setup. **Key Details** - **Model:** Gemini210 - **Color:** Black (as shown in images) - **Material:** Durable ABS plastic housing - **Dimensions:** 8.85 x 29.8 x 38.3 mm (small, lightweight design) - **Waterproof Rating:** IP54 – resistant to splashes and light rain - **Battery:** 1x CR2032 button cell (included) - **Battery Life:** Up to 400 hours of continuous use - **Wireless Connectivity:** Bluetooth & ANT+ (dual protocol) - **Sensor Type:** Geomagnetic speed sensor **Package Includes** - 1x Speed sensor (with pre-installed battery) - 1x User manual (English) **How to Use** 1. Remove the insulation paper under the battery cover before first use; ensure the battery’s “+” side faces up. 2. Install the sensor on your bike’s front or rear hub using the provided rubber mount (sold separately if not included). 3. For speed mode, open the companion app and set your wheel size to ensure accurate readings. 4. If you want to use both speed and cadence functions simultaneously, you will need to purchase a second sensor. **Important Notes** - Slight color variation may occur due to photography lighting. - Dimensions are measured manually; allow a small tolerance. - This sensor is NOT a medical device and is intended for recreational cycling use only. - Keep away from children under 3 years due to small parts (battery). **Quality Assurance** We prioritize quality and customer satisfaction. If you have any issues, contact us for prompt support.