【BIKE COMPUTER WITH BUILT-IN HIGH-SENSITIVITY GPS CHIP】This wireless bike computer has a built-in high-sensitivity GPS chip and supports three systems: Beidou, GPS, and GLONASS for fast global positioning. Just set the TIME ZONE before use, and the time will be automatically calibrated according to local time. 【MULTIFUNCTIONAL BIKE SPEEDOMETER】The GPS bike speedometer is small, lightweight, IPX5 waterproof, and automatic sleep mode makes it convenient. This bike speedometer works well for measuring speed, altitude, distance, riding time, etc. It is more suitable for serious cyclists or fitness fanatics to record and manage cycling data during training. 【DAY & NIGHT BACKLIGHT】This advanced GPS bike speedometer is designed with day and night backlight. Just press the back and right buttons simultaneously to change the backlight level for easy viewing in sunlight and night cycling. The 1.7-inch anti-glare LCD allows you to easily see data from any angle. 【WIRELESS DESIGN & USB RECHARGEABLE】Unlike traditional wired bike computers, there are no annoying cables; this wireless bike computer is very easy to install. The USB rechargeable design allows it to adapt to any charging device with a USB DC 5V port. The 400mAh lithium battery provides up to 8 hours of operating time.（PA）