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Equipped with dual functions that allow tuner and metronome to be used at the same time; Equipped with a sound-back function that allows you to tune with a meter while listening to the sound. C6 (1046.50Hz) Other control functions: Memory backup function, genuine 3 degrees, short 3 degree marks, sound back function, metronome function (0-9 rate), tap function, volume stepless adjustment connection terminal: Input (standard mono jack), Output (mini jack) Power supply: AAA batteries x 2 battery life... Tuner: approx. 130/55/36 hours (backlight off/soft/auto). 130/55/36 hours (backlight/off/soft/auto); External dimensions (W x H x D): 4.4 x 2.9 x 0.7 inches (111 x 74 x 18 mm); Weight: 3.6 oz (103 g) (including battery); Accessories: AAA batteries x 2