Versatile Output Waveforms: Produces 15 waveforms, including sine; square; triangle; positive and negative sawtooth; ECG; exponential rise; exponential fall; Lorentz pulse; Gauss pulse; Sink pulse; half wave; full wave; Schumann wave and noise wave Double Power Options: Compact and portable, powered via AC/DC adapter or battery for use in classrooms, labs, or field testing. Includes a switchable filter for precise sine and pulse output, ideal for oscilloscope calibration and testing audio amplifiers 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 Complete Package with Schumann Resonator: The included Schumann resonator enhances mental relaxation while providing reliable performance for engineers and audiophiles High Precision and Stability: Built with quality pulse chips; precision resistors and correction capacitance for stable frequency generation. Features a user friendly Type-C connector for easy connection, Manufacturer: shaojian