waves themselves do not directly act on sound or video products to improve sound quality, but rather on the spatial environment, relaxing the body and mind, improving the body's perception of sound and images, improving the efficiency of human health work, and relieving psychological stress. They also have good effects. The digital circuit crystal oscillator frequency reference is more stable and has stronger anti-interference capabilities. It uses low-temperature drift crystal oscillators and high-precision dedicated chips, which can accurately output frequencies and pure sine waves. Antenna waveform: sine wave Power supply interface: Android interface Power supply voltage: 5V<br><br>Rated power consumption: Less than 1W Default frequency: 7.83Hz Adjustment range: 0.1Hz~99999Hz Sine signal voltage amplitude: 3V Square wave signal voltage amplitude: 5V 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 Color: As Shown Material: PCB<br><br>Package Contents: 1 * FM 1 * Extended antenna set<br><br>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.