0.56 Inch 4 Bit Red Digital Tube Electronic Clock DIY Electronic Production Suite
Main chip: AT89C2051
Power Supply voltage: 3V-6V
1.2mm thick high quality FR-4 PCB
PCB dimensions: Length 52mm * Width 42mm
With second correction for precision calibration
Minute and second can be displayed independently
8:00-20:00 point hours timekeeping (can close it)
Two-Way alarm clock setting (can turn it off )
Time accuracy: error range ±1 second per 24 hours
With a USB to 3.5mm power cable, plug in the USB charger can be used, easy to power supply.

How to set it?
1. As your looking at the LCD there are two buttons under the screen. The left button is S1, the right button is S2. S1 advances the sub menus, S2 changes the value.
2.Hold S1 to enter clock setting mode
""A"" Set hour
""B"" (looks like the number 8 on the screen) Set minutes
""C"" Set Chime On/Off
""D"" Set Alarm 1 On/Off
""E"" Set Alarm 1 Hour
""F"" Set Alarm 1 Minute
""G"" Set Alarm 2 ON/OFF
""H"" Set Alarm 2 Hour
""I"" Set Alarm 2 Minute