4 Side Countdown Timer Timer butler on the chess table. Make chess games more standardized. Model Poker Timer (Black) Brand GANXIN Usage LED Countdown Clock Size 4.7 x4.7x4.0 inch (12x12x10 cm） LED Color Red, Blue,Green Frame Materials Black ABS Power Supply 1.5V AA Battery x 4 Control Mode Button Installation Stand on the table Working Environment -10℃~50℃ Working Humidity 0~95%RH What's in the box? 1*Led Clock 1*User Manual Switch Clock State "OF":Turn off clock "OE":Buzzer OFF "OP":Buzzer ON Button Control Green Button: 20 seconds countdown Press the button, the timer show 20 seconds in green color.Press again to start/stop timing Blue Button: 25 seconds countdown Press the button, the timer show 25 seconds in blue color.Press again to start/stop timing Red Button: 30 seconds countdown Press the button, the timer show 30 seconds in red color.Press again to start/stop timing Yellow Button: Reset to preset time Power Support The battery box is at the bottom of the clock. It need 1.5V AA battery x 4 to support power. There have a toggle to switch power on/off. It can Energy Saving when you don't use clock. How to edit time of each button For example, Red button =15 seconds Step 1, Press the red button for long time till the led digits blink. Step 2, Press green button to +1, press blue button to -1. Step 3, After setting the time , the digits will blink for 5 seconds.Then the data will be saved. How to edit time of each button For example, Red button =15 seconds Step 1, Press the red button for long time till the led digits blink. Step 2, Press green button to +1, press blue button to -1. Step 3, After setting the time , the digits will blink for 5 seconds.Then the data will be saved.