1It"s a presettable count-up timer, maximum up to 10 hours, light weight and portable, convenient for your carrying,we will give you a protect package for free to help you protected your chess clock2During the game, can modify the timing parameters of the both sides. Shutdown and then boot (non-outage), it can keep the last rule parameters before the shutdown, before switching count on and count down, the machine need to be restarted;3Each step reward, each step delay timing rules. The left and right sides can set different basic time and auxiliary parameters, with alarm when the match is over;4Made of durable ABS plastic casing, safe, environmentally friendly and durable;5Suitable for Chinese Chess, International Chess , home and competitions;