The SPD61 speed sensor is a compact and accurate unit to capture bicycle speed data.

Easy to install (doesn't require a magnet) and with wireless data transmission via Bluetooth or ANT+ protocol. Approx. 260 hours long battery life.

Weight: 9.6g (include battery)
Physical dimensions: 37mm x 36mm x 10mm
Waterproof: IPX7
Battery: 12 months (Based on 1 hour's usage per day)
Wireless transmission: Bluetooth 4.O BLE; ANT+ /2.4G
Compatible Devices: iPhone 4s/5/5c/5s/6/6 Plus IiPod touch 5 iPad 3/4/ Air/miniCompatible Samsung Galaxy S4/5/6/Not3devices Google Nexus 4/5/6 Android 4.3 BLE devices Garmin Watch(support ANT+)
Box includes: 1 x SPD61 unit, 1 x Strap, 1 x User Manual, 1 x CR2032 Battery