"Large Seesaw Button: Feel good, quick response, convenient control, more suitable for fast chess. There are 42 timing rules in 8 categories, including single/multiple countdown, reward, time limit, delay, seconds, and forward timing.Multifunction: This chess clock with countingcount downbonusdelayalarm on/offmove counts & setting memory. Not only this digital timer allows checking moves for both players, but allow to adjust the rest of time.Dimensions and Portable: About 161x100x62mm/ 6.34x3.94x2.44inch. Made of electronic components + ABS shell, environmentally friendly and durable, which is light weight and portable, convenient for your carrying.Support Games: Available for International Chess, Chinese Chess, I-GO,and other type board games. Many tournament has used this clock for the competition.You can set up two different base time on both sidesBattery Powered Portability: 2 single AAA battery(not included) is all you need if you run out of power after a long streak of chess games. The portable chess clock is a timer with extremely long battery life, so you'll rarely need more than one battery with you to assure the game never ends."