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 , or other USB powered devices to work. Antenna waveform: sine wave Interface waveform: sine wave + square wave + inverted square wave (The lower left corner is the output interface, and the waveforms are output at the same time) Power supply interface: DC5.52.1 Power supply voltage: 5V Rated power consumption: Less than 1W Default frequency: 7.83Hz Adjustment range: 0.1Hz~30000Hz Sine signal voltage amplitude: 3V Square wave signal voltage amplitude: 5V The product can not only output 7.83Hz wave, but also adjust the frequency in the range of 0.01Hz-30000Hz, digital circuit crystal oscillator frequency reference, more stable, stronger anti-interference, using low-temperature drift crystal oscillator and high-precision dedicated chip, can precisely output frequency and pure sine wave. Note: Please check as much as possible to make sure the item is what you need. Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Colour:Black Material:PCB Package Contents: 1 x Wave Generator 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.