Anti Signal Interference: It won't interfere other wireless & electronics devices, wireless ranged less than 60 cm, accurate data result. Probe and the magnet should be a 2mm sensing range, within the handlebar diameter 2.5CM Small size, light weight, multi-function: Functions as a bicycle speedometer AND odometer, measuring both speed, distance, and riding time, three numbers which no serious bicyclist or fitness fanatic wants to go without knowing Auto Sleep/Wake: Auto standby within 300 seconds during inactive use, CLK Data will stay, it will start up if any button is press and detect any movement Auto Detect: There is a small ball inside that will create movement to awake & auto start-up, you can hear it when you shake the device Suitable to all types of bicycles: road cycling, mountain biking, folding bike, common bicycle. Perfect device can also be used for hiking, climbing, and many other fun, adventurous outdoor activities