SUNSKY YS Electronic Stopwatch Timer Track And Field Training Running Watch, Style: YS-830 30 Memories (Black) YS-830 30 Memories

Button design, comfortable and not stuck, reinforced, durable

Waterproof for life, waterproof against rain and sweat, just wipe it dry after use

Can be turned off, the clock does not need to be reset, save energy

Function: stopwatch, clock, calendar, countdown, alarm clock, metronome, shutdown, mute

Power supply: contains a CR2032 button battery