1. Seconds correction (for precise School) 2. Switch to every minute independent display interface 3. whole point of time (8-20 o'clock chime can be turned off) 4. Two alarm settings (you can turn off the alarm function)
Kit Features: A. 0.56 inch special red digital clock for display; B. Import AT89C2051 for master chip; C.1.2mm thick PCB made from military grade FR-4 board; D. accurate travel time, travel time error range error -1 to +1 seconds every 24 hours.
setting, LED flashes the last one, the last one by S2 plus one, between 0 and 9 cycles, digital the greater the faster the clock, press S1 to confirm the setting and return to the clock display. Set.
1 x AT89C2051 Digital 4 Bits Electronic Clock Electronic Production Suite DIY Kit