Description 100% quality assurance. Dimensions (W x D x H) 129 mm x 78 mm x 39 mm Weight 130 g (excluding batteries) Power source 2 AAA batteries (2 x Alkaline 1.5V or 2 x NiMH 1.2), USB bus power supply (500mA or less) Input/Output Input: 3.5mm stereo x2, 10V max Through output: 3.5mm stereo x2 Output: 3.5mm mono x2, 5V max Oscilloscope: 3.5mm stereo x2, 10V max Display mode: Single, stereo (Input1L-INPUT1R, Input1L - Input2L, Input2L - Input2R), 4ch, XY (Lissajous mode, 2ch) Vertical: 10mV~5V/div, AC/DC mode switchable Horizontal: 50us~1s/div Trigger : Auto, Rise, Fall, Single(rise), Single(fall) FFT (spectrum analyzer) Input : Monaural (1L, 1R, 2L, 2R) Frequency range 20Hz~20kHz Function Generator Waveforms: sine, square, triangle, saw, noise, pulse, envelope Frequency range: 1Hz~10kHz, Hz/NOTE mode switchable, [1ms~10s, sec/BPM switchable (pulse, envelope mode) envelope mode)] Output level : 10Vpp max, V/dB mode switchable Tuner Display mode: needle, meter Inputs: mono, stereo (Input1L-Input1R, Input1L-Input2L) Calibration: 410~480Hz Accessories: USB cable, assembly manual USB cable, assembly instructions About Us -----Important----- Import duties, taxes and charges are not included in the item price or shipping charges. These charges are the buyer?s responsibility. Please check with your country?s customs office to determine what these additional costs will be prior to bidding or buying. Customs fees are normally charged by the shipping company or collected when you pick the item up.These fees are not additional shipping charges. We won't under-value merchandise or mark the item as a gift on customs forms.Doing that is against U.S.and international laws.