The circuit op amp works in dual state (dual supply amplification does not require a DC blocking capacitor to high and low frequency signals are not distorted). It can output triangular wave, rectangular wave and sine wave, and forward and reverse wave. SYNC output with sync signal. Switching the waveform output by push button, easy operation. Adopts with clear shell, the signal generator is very beautiful and practical. The product is a DIY kit, not a finished product Temperature drift: 200ppm/Celsius. DIY Supplies: Electrical Number: Signal Generator Single supply operation (-in dedicated management IC): single supply operating voltage 9-15V. Frequency Adjustment Range: 1Hz-20MHz Duty Cycle Adjustment Range: 15%-85% Low Loss True Sine Wave: 0.75% triple-cornered Wave Output Linearity: 0.1% Low Impedance Output Buffer: 0.1ohm DC Offset Adjustable: -5V-5V Adjustable Output Amplitude: 0.1V-9.5VPP (operating voltage 9V) Item Weight: 82g / 2.90oz colour:White Material:PCB size:99 x 59mm Package Contents: 1 x Signal Generator 1 x Manual (English) Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.