1. The device generates an extremely low frequency electromagnetic wave that can penetrate various materials and is non-ionizing radiation. 2. The Schumann wave is a naturally occurring frequency, and the device simulates this frequency electronically. 3. By generating a frequency that corresponds to the Earth's natural resonance, the device may support overall balance and help reduce the effects of environmental electromagnetic fields. 4. The device uses electronic simulation to produce a 7.83 Hz frequency, typically associated with the Schumann resonance, using a square wave or sine wave signal. 5. It is designed to emit a consistent electromagnetic field that may promote cellular balance and help mitigate interference from external electromagnetic sources. Specification: Item Type: Schumann Wave Generator Power Supply: Built-in Lithium Battery Micro-USB Charging, with 4 Light Battery Display Power Consumption: 5V 0.08A Working Frequency: 7.83Hz, a sine wave is generated by a programmable intelligent chip. Waveform, frequency, and power can be set (fixed by default). Higher frequency accuracy and stability consistency. Another USB-A for External 5V Power Supply Size: 80 x 76 x 24mm / 3.15 x 2.99 x 0.94in Color: White Material: PU + Plastic Package Contents: 1 x Schumann Wave Generator 1 x USB Cable Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture to vary slightly from the real thing. The measurement allowed error is +/- 1-3cm.