Speed sensor SPD70 from IGP Sport. 

Battery life indication and new one-piece rubber mount. 

Connecting with most of the cycling devices on the market.

Built-in geomagnetic sensor, stable and efficient data transmission with Bluetooth /4.0 BLE; ANT+ /2.4G. 

Supports IGP App data tranfer.

260 hours long battery life - 12 months (1 hour's usage per day)    

Compact size, lightweight and IPX7 waterproof.