Fangrui Product Details 1hz-500khz Dds Signal Generator With Schumann Resonator: Combines The Functions Of A High-frequency Signal Generator And A 7.83hz Schumann Resonator To Provide Electronic Circuit Testing With Stress-relieving Benefits, Setting It Apart From Standard Models. Versatile Waveform Generation: Produces Sine, Square, Triangle, And Sawtooth Waveforms. Includes A Switchable Filter For Precise Sine And Pulse Outputs, For Oscilloscope Calibration And Testing Audio Amplifiers. Dual Power Options: Compact And Portable, Powered Via Ac/dc Adapter Or Battery For Use In Classrooms, Labs, Or Field Testing. Complete Package With Schumann Resonator: The Included Schumann Resonator Enhances Mental Relaxation While Offering Reliable Performance For Engineers And Audiophiles Alike. High Accuracy Stability: Built With Quality Pulse Chips, Accurate Resistors, And Correction Capacitance For Stable Frequency Generation. Features A User-friendly Type-c Interface For Easy Connectivity. Colour:as Shown Material:composite Ma