【13 Built-in Waveforms】The Schumann Wave Generator outputs sine wave, square wave, triangle wave, forward/reverse sawtooth, half-wave, exponent rise/fall, and a dedicated 7.83Hz chopped wave 【Ultra-High Frequency Precision】This signal generator uses a low-drift crystal oscillator. Frequency stability is excellent with resolution down to 0.001Hz, ensuring accurate low-frequency signals for demanding applications like Schumann wave generation 【1.8-inch TFT Display & Keypad】This portable signal generator features a color TFT screen and a numeric keypad for direct frequency entry. All settings are automatically saved, so you don't need to reconfigure after power-off 【Wide Frequency Range】Sine wave output from 0.001Hz to 200kHz (flat amplitude to 100kHz). Other waveforms from 0.001Hz to 20kHz. The board includes a helical antenna for precision chopper wave generation 【Applications】By improving human condition and spatial energy, it indirectly enhances the sensitivity to sound and images, adding extra gain to the home theater; it also helps relieve stress and calm the mind