Specifications: the Output Signal Types: sine, square, triangle, positive and negative sawtooth waveform. Frequency range: sine is 1Hz-500kHz, other waveforms is 1Hz-20kHz. resolution: 1Hz Sinus Distortion: below 1 kHz lt,1%, over 1 kHz lt,0.5%. DC Offset Range: 10 V (Can be closed) output Range: 10 V (P-P) Output impedance: 50ohm Supply voltage: DC3.5-10V. LCD Item Size: 14 * 8 * 3.5 cm / 5.51 * 3.15 * 1.38in LCD screen: 6.5 * 1.5 cm / 2.56 * 0.59in Item Weight: 197.5g / 6.96 oz package Size: 23 * 16 * 3.5 cm / 9.06 * 6.3 * 1.38in package Weight: 202.5g / 7.15 oz This functional signal generator can test many kinds of wave forms such as: sine, square, triangle, positive and negative sawtooth waveform. it is especially designed for those professional employees. characteristics: it is small but has many functions, easy to operate and carry. It can be used with oscilloscope to test and debug electronic circuit, frequency response of audio amplifier and impulse response. the square waveform is suitable for oscilloscope attenuator and the adjustment of probe pulse response. It can also calibrate the sweep time factor of oscilloscope. have a filter (can be opened and closed) to the output of sine wave and pulse wave.