Fangrui Product Details 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 ~. 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 6.1.8-inch Tft Color Display 7.onboard Power Indicator, Pwm Output Indicator Colour:blue Material:pcb+electronic Components Package Contents: 1 X Oscilloscope 1 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.