Operating voltage: DC7-9V; DDS frequency range: 1HZ-65534Hz. Display: 1602 LCD High-speed frequency (HS) output up to 8MHz DDS signal amplitude of the offset amount can be adjusted separately by two potentiometers DDS signals: sine wave, square wave, sawtooth, reverse sawtooth, triangle wave, the ECG wave and noise wave Section into the value:1,10,100,1000,10000 Hz The power automatically restore the last used configuration Offset:0.5pp-5Vpp Amplitude amount:0.5Vpp-14Vpp Key Functions: The UP output waveform select The DOWN output waveform select LEFT output frequency - RIGHT output frequency + STOP / RUN the output stop / start. "UP" key waveforms order: ECG = electrocardiogram wave (in the OFF state, the "left" and "right" keys to set the output frequency. Middle button start, all of the following waveform set) Rev Sawtooth = reverse sawtooth SawTooth = sawtooth Triangle = triangle wave Square = square wave Color:As Shown Material:Electronic Component Package Contents: 1 * DDS function signal generator module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.