Large Button: Feel good, quick response, and convenient control, more suitable for fast chess.
Function: There are 39 timing rule in 7 categories, including single/ multiple count down, reward, for time limit, delay, seconds, and forward timing.
Keep Parameters: Power back on after power off, you can keep rule and parameters of race before power off. for 3V power supply (two batteries are not included).
Settings: Different timing parameters can be set on the left and right sides. During race, the timing parameters of both sides can be changed.
Presets Rule Printed On The Back: Easy to use 39 presets rule, ready-to-use; The default value can be changed and saved inside for repeated use.