Features: Compact size, fully functional, easy to operate, and easy to carry. It can be powered by an adapter or a lithiums battery. Together with an oscilloscope, it can be used for electronic circuit testing and debugging, as well as testing and measuring the frequency characteristics and pulse response of amplifier. Due to the good accuracy and frequency stability of DDS, it is also very suitable for oscilloscope scannings time factor calibration. square waves output is suitable for adjusting pulse characteristics of oscilloscope attenuators and probes. Frequency range: Sine waves 1Hz-500kHz (where the output amplitudes is flat to 200 kHz, and the output amplitudes will decrease as the frequency further increases), other waveforms 1Hz-20kHz (but the adjustable frequency limit is not limited. If there is no highly requirement for distortion and shaking, the frequency can be further increased). Output waveform: sine waves, square waves, triangular waves, forward sawtooths waves, reverse sawtooths waves. Specifications: Material:ABS Resolution: 1Hz. Sine waves distortion: