Introduction - If you have any usage issues, please Google them yourself
Basic functions: input 1kHz clock 2, display hours, minutes, seconds, 24-hour clock 3, hour and minute correction function 4, when the timer runs to 59 minutes 49 seconds timekeeping, each tweet 1s stopped called 1s resonance called ring the first five ring for the bass frequency to 500Hz rings treble frequency of 1 kHz 5, can set a time period during nighttime chime 6, set the alarm.