ZOMTOP Bike Speedometer, Bicycle odometers,Bicycle Speedometer Wireless Cycle Bike Computer Waterproof Bike Odometer with LCD Display Speedometer Accurate Speed Tracking & Multi-Function - Speedometers-546C

• [SMART BIKE SPEEDOMETER] The Basecamp wireless speedometer is small, lightweight, easy to install and read numbers on LCD display .The circumference ranges is 0mm-9999mm (Nomarl wheel circumference have been offer in the user manual) [MULTI-FUNCTIONS] As a bicycle speedometer and odometer, measuring both speed ,distance, and riding time, these are needed by bicyclist or fitness fanatic wants to know. Please note the slight rattle sound from device is normal phenomenon, which results from the design of wireless automatic function [BACKLIGHT FUNCTION] Back-light will turn on when press any button during 8:00am and18:00pm. The back-light can be set in either green and white. Built-in steel ball switch that will shake when receiving signals,speedometer will be automatic awake from sleeping mode.In the mean time you may hear slight rattle from the device.It's common phenomenon as steel ball is working.No worry about it [WATERPROOF AND PORTABLE DESIGN] Wireless and waterproof design make it convenient and durable. This bike wireless odometer can help you measuring speed and ride time, no need to worry about raining [FERFECT FOR ALL OUTDOOR ACTIVITES] The bike wireless speedometer is suitable for all types of bicycles,such as road cycling, mountain biking, folding bike. It can also be used for hiking, climbing, and many other fun, adventurous outdoor activities