(Bass)±12dB at 75Hz (Midrange)±12dB at 750Hz (Tweeter) ±12dB at 10KHz Low Voltage Indication A4 Frequency: 440Hz Calibration range: 0A(27.5Hz)-8C(4186.01Hz) Weight: 49g Dimensions: 51(W) x 51(H) 42(Th) mm Battery: One 9-volt, 6F22 battery