1.BNC interface, suitable for general oscilloscope probes. 2.AC and DC coupling can be switched, 1:1, 1:50 attenuation ratio can be switched 3.Built-in square wave signal output, duty cycle, frequency, enable adjustable, output amplitude 3.3V, output frequency range 1KHZ~8KHZ, output duty cycle range 0%~97%. 4.10BIT resolution, 1MHZ sampling rate, signal measurement range 1KHZ~100KHZ (sample code, if you need a larger measurement range, you can modify the sample code for secondary development.) 5.TYPE-C interface power supply 1.8-inch TFT color display Onboard power indicator, PWM output indicator Colour:Blue Material:PCB+electronic components Package Contents: 2 x Oscilloscope 2 x Probe detection line 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.