Built-in high-sensitivity GPS chipM3 adopts high-sensitivity GPS chip, which supports Beidou, GPS and GLONASS fast global positioning systems. M3 doesn't need to set the time, you just need to set the time zone before use. After GPS positioning, the time will be automatically corrected according to the local time. The local time zone can be checked online.[ANTI-GLARE MONO LCD] 1.7-inch anti-glare MONO LCD, clearly visible from all angles in the sun, full-screen white backlight, night riding, whether in the sun or night, you can clearly see the data, never worry about the dark. (Press the top two buttons at the same time to turn on the backlight, the backlight level is 1).USB Rechargeable, Peak Run Time 8 HoursUSB Rechargeable, can be charged with any charging device with USB DC 5V port. After the backlight is fully charged, the usage time is 8 hours, and the GPS search signal may cause high power consumption, which is a normal phenomenon.Riding data displayThe device supports 9 kinds of common riding data display: riding time, current/average/max speed, speed comparison, current time, altitude, ODO, riding distance and total time. NOTE: Make sure your M3 is connected to GPS before riding.Store and view history recordsAutomatic storage, can store 30 riding records. Long press the right button to enter the historical data view; to exit the historical interface, also long press the right button. Tip: M3 GPS cycling computer does not support track storage and data uploading. Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 458 hours, wish you a happy shopping!