BodyCraft Dual Cadence/Speed Sensor helps you track your fitness progress by measuring your cadence (pedal revolutions per minute) and speed while cycling. This information can be useful for optimizing your training and monitoring your performance. The sensor is easy to install and can be attached to your bike's crank arm and wheel hub. It is compatible with ANT+ and Bluetooth SMART devices, so you can connect it to your smartphone, bike computer, or other fitness tracking devices. The sensor is powered by a CR2032 3V Lithium Battery and has a long battery life.