Sports Stop Timer Keychain with Digital LCD Screen-Pocket Size Countdown Clock Cooking,Training | Portable Electronic Stopwatch This is not a clock, you cannot check the time. It is a timer that supports both positive and negative timing methods. Notice: 1. The size information is measured manually. Please allow the difference of 1-2 cm due to manual measurement. 2. The difference between different monitors, the picture may not reflect the actual color of the item.