The circuit op amp works in state ( 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 beautiful and practical. The product is a DIY kit, not a finished product Temperature drift: 200ppm/Celsius. : Electrical Model Number: Signal Generator Single power supply operation (built-in dedicated power management IC): single power supply operating voltage 9-15V. Frequency Adjustment Range: 1Hz-20MHz Duty 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 cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.