1It's a presettable count-up timer maximum up to 10 hours light weight and portable convenient for your carryingwe will give you a protect package for free to help you protected your chess clock 2During 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;