Specifications BrandiGPSPORTModelSPD70Battery1 CR2025 Included Wireless TransmissionBT5 0 ANT Working TimeApprox 300 hrsWaterproofIPX7Shock Resistance1 5m Natural DropSize33 35 4 10 8mmWeightApprox 8 1g Features 1 Tracking speed data in real time on your bike computer or smartphone with compatible training apps 2 Support connecting any BT5 0 or ANT enabled device and smartphone 3 Long battery life for you Normal use is up to 300 hours 4 IPX7 waterproof no fear of water and rain You can ride in tough weather conditions 5 Small size lightweight and no magnet design 6 Easily install on your bike s crank arm with the included rubber rings Package includes 1 x Speed Sensor3 x Rubber Strap1 x User ManualNotes 1 Due to different monitors and light effects the actual color of the item may be slightly different from the color shown on the pictures 2 Please forgive slight measurement deviation due to manual measurement