Fangrui Product Details Using High-quality Materials, The Product Has Good Frequency Stability; This Product Not Only Outputs 7.83hz Waves, But Also Incorporates Programmable Frequency Modulation Technology, Which Can Adjust The Frequency In The Range Of 0.1hz To 30khz; Digital Circuit Crystal Oscillator Frequency Reference, More Stable And Stronger Anti-interference; The Power Interface Adopts Dc5.5 * 2.1 Or Micro-usb Interface, Which Is Convenient To Use. The Usb End Can Be Plugged Into The Power Bank, Usb Charging Head, Or Other Usb Powered Devices To Work. Parameter: Antenna Waveform: Sine Wave Interface Waveform: Sine Wave+square Wave+inverse Square Wave (the Bottom Left Corner Is The Output Interface, And The Waveform Is Output Simultaneously) Power Supply Interface: Dc5.5 * 2.1 Power Supply Voltage: 5v Rated Power Consumption:less Than 1w Default Frequency: 7.83hz Adjustment Range: 0.1hz~30000hz Sinusoidal Signal Voltage Amplitude: 3v Square Wave Signal Voltage Amplitude: 5v Circuit Board Size: Approximately 15 X 14cm C