SpecificationBlack standard model:Antenna waveform: sine waveInterface waveform: sine wave + square wave + inverted square wave (the lower left corner is the output interface, waveform output at the same time)Power supply interface: DC5.5*2.1Supply voltage: 5VRated power consumption: <1WDefault frequency: 7.83HzAdjustment range: 0.1Hz~30000HzSine signal voltage amplitude: 3VSquare wave signal voltage amplitude:5VCircuit board size: about 15*14CMWith shell size: about 15.5*14.5*2.8CMChange frequency method.Input the frequency directly, press the lower-left key, you can complete the setup.For example, press [7][...]. [8][3], and then press [OK], you can set to 7.83Hz default power output 7.83Hz, set the range 0.1~30KHz.Using Methods.Take out the USB cable with the product, connect and plug it into the circuit board, and plug the USB end into the rechargeable treasure or USB charging head or other USB powered devices to work.List1 x Schumann Wave Generator (with case/without case optional)1 x USB cable