Item Type: STM8S005 DC Control Circuit Board Mateial: PCB, Acrylic Input: 5 V Battery Model: CR1220 Battery (Not Included) Package List 1 x Circuit Board 2 x Acrylic Board 8 x Screws 8 x Nuts 1Using STM8S005 as the main control, builtin program, you can directly use the welding lamp. 2Using imported highprecision clock chip, the error is less than 1 minute per year. 3This DC Control Circuit Board uses the integrated IC driver and the screen is more stable and reliable. 4Support sevencolor display clock ,including RGB lights, and 24hour mode time display. 5Its function includes 24hour mode, time display, antivirus program (Update the monitor every 10 minutes ), no alarm, not support remote control, No time switching machine.