BUILT-IN HIGH-SENSITIVITY GPS CHIPThis bike computer has a bulit-in high sensitivity GPS chip and supports three systems: Beidou, GPS and GLONASS fast global positioning. Just set the TIME ZONE before use, then the time will automatically calibrated according to the local time.MULTI-FUNCTIONSSmall size, light weight, IPX5 waterproof, auto sleep function makes it convenient and durable. This bike speedometer works well to measure speed, altitude, distance, riding time and etc. It fits better for serious bicyclist or fitness fanatic to record and manage the cycling data in the training.DAY & NIGHT BACKLIGHTThis advance cycling computer is designed with day & night backlight. Only press the back and right button at the same time to change the backlight level for easy viewing under the sun & night riding. 1.7 inch anti-glare LCD will make you easy to see the data at all angles.WIRELESS DESIGN & USB RECHARGEBLEUnlike traditional wired bike computer, there are no annoying cables, this wireless bike computer is very easy to install. USB rechargeable design make s it adapt to any charging device with USB DC 5V port. 400mAh lithium battery provides up to 8 hours run time.