Compatibility ANT+ protocol Supports various ANT+ protocol bicycle computer and sports watch Supports different PC training software by ANT+ adapter Bluetooth protocol Works with standard Bluetooth speed or cadence protocol phone App Works with standard Bluetooth speed or cadence protocol Bluetooth bicycle computer or watch Bi-mode Usage Method If the speed and Cadence use together,need buy two pcs In speed model , use the app need set the wheelset size then can Exact display speed First use the equipment,need remove the Insulating paper make sure the battery + up Reinstall battery can Switching Mode speed model to cadence model or cadence model to speed model Cadence Sensor Mode Resetting the battery, red light signs cadence mode Speed Sensor Mode Resetting the battery, green light signs speed mode Specifications: Volume: 8.85×29.8×38.3mm Sensor: Terrestrial-magnetic Sensor Battery: CR2032 battery Weight: 8.8g (with battery) Highest Detecting Speed: 700c 110km/h Operating Humidity:－10°C— 50°C Wireless Interface: Bluetooth Smart, ANT+ Waterproof: IP66 Package include: 1* Speed + Cadence bi-mode sensor