Chess Clock: Professional Digital Timer with Count up / Countdown Timer, Maximum up to 10 Hours. Available for Chinese Chess, International Chess，I-GO and Other 2 Players Board Game. Chess clock timer is made of electronic components & ABS shell, environmentally friendly and durable. Alarm as the time Runing out. Can Turn up/off the Alarm;1 x AA battery (Not Included in the package). Bouns and Delay functions with Easy Setting, Light Weight, Setting Memoried.