Product description: power supply: 1x AA battery (1.5V) (battery not included) color: brown material: High quality ABS certified: CE, RoHs. size approx. 140mmx 93mmx 49mm N.W about 150g (135g without battery) operating temperature: -5 50Humidity: 85Class protection: IP50 Multifunction: 1, countdown and countdown, maximum 10 hours 2, Bonus and delay approx. 59 seconds 3, setting time respectively for competitors 4, last pattern reminder when power on 5, mute and alarm function Storage Notice: The chess timer should be kept in a dry and ventilated place. The temperature stays between 5 35. Relative humidity should be below 70%. Keep the multimeter from goods containing corrosive gases. The chess clock timer, perfect companion for chess games, easy to use to play games with friends, family at home. bar, at the club, at home Multifunction: countdown and countdown, maximum 10 hours, presettable. Bonus and delay, alarm function when the game is over Solid and works well, LCD display, visible and accurate. 1pcs AA batteries powered Made of high quality ABS, lightweight and with a pocket, easy to carry the chess clock anywhere