wave is a beneficial pulsating rhythm wave, which appears in the ionosphere of the . frequency is 7.83 Hz, which happens to be the same frequency as the hippocampus in the mammalian . wave 7.83Hz Can offset the frequency of the negative interference of electromagnetic waves and radio waves, so the sound space reverberation is stable and harmonious, so listeners can enjoy music more physically and mentally and the body, the perception of sound and images, The health of the human body improves the efficiency of work and has a good effect on insomnia and mental stress. wave: Helps to sleep, helps to the of wine, tea, and water! Relieve stress. 3 color LEDs, a 7.83Hz working indicator, purple LED, flashing according to the working frequency, equipped with a USB cable, can be directly plugged. For space-to increase , For - and productivity. Product Usage Tips: It is recommended to place the product at a height of 1.5 above the ground, which is more conducive to the coverage of Schuman Wave. The area of each product should be no more than 18 square . Item Type: Generator Product name: wave extremely low frequency generator Power Supply:USB cable or 5V power bank(power bank not include) Power: 2W Input: 5V Working Frequency:7.83Hz colour:White+black Material:plastic size:120 x 120 x 30mm Package Contents: 1 x Generator 1 x USB cable Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.