Saris ANT+ Bluetooth Speed/Cadence SensorTo make training and data recording easier to setup and hassle-free to align, Saris has developed a Speed and Cadence sensor within the same unit. No longer do you have to fiddle around adjusting the positioning of magnets to track your performance. With this ANT+ Bluetooth Speed/Cadence Sensor, all you need to do is install the battery, set the sensor to record speed or cadence, then mount it to either crank arm or your bikes wheel hubs, and you are ready to get out and start crushing PB's and KOM's. Features: Dual band Bluetooth Smart and ANT+ compatibility Low profile design to fit a wider range of bicycles Uses an accelerometer to acquire data; no magnet required In the Box: three bands, one-coin cell battery, battery, rubber backing, speed/cadence sensor Connectivity: ANT+ & Bluetooth SMART Firmware Updates: Bluetooth Over the Air (OTA) Light Indicator: White (Speed), Green (Cadence) Sleep Time: 5 Minutes Accuracy: +/- 2% Water Resistance: IPX7 Battery: CR2032 Battery Life: 200 HoursBuy Saris Nutrition & Training from Chain Reaction Cycles, the World's Largest Online Bike Store.