It is a preset counting timer, maximum up to 10 hours, lightweight and portable, convenient for your carrying, we will give you a protection package for free to help you protect your clock from failures.2 During the game, can change the timing settings on both sides. Stop then start (non-failure), it can keep the last rule settings before shutdown, before switching countdown and countdown, the machine must be restarted;3 Each step rewards, each step delay rules of synchronization. Left and right sides can set different basic and auxiliary parameters, with alarm when the match is over;4 Made of durable ABS plastic case, safe, eco-friendly and durable;5 Suitable for Chinese chess, chess international, home and competitions;