Usage Tips:Name: Schumann wave very low frequency generator Frequency: 7.83HZ Power: 0.5W Built-in 1000MHA battery, one charge takes about 1 month Output waveform: square wave The blue light is flashing, the normal mission state (normal work) Red light on, charging Green light on, fully charged. If the switch is about to work, all the lights are off, indicating that the battery is low and needs to be charged. Colour:gold / silver Material:plastic Note: Installation guide not included, we strongly recommend you seek professional installation. Please check as much as possible to make sure the item is what you need. The actual product may have slight color difference or difference, which will not affect the use Package Contents: 1 * Schumann Wave Generator 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.