Schumann wave is a beneficial pulsating rhythm wave, which appears in the ionosphere of the atmosphere. Its frequency is 7.83 Hz, which happens to be the same frequency as the hippocampus in the mammalian brain. Schumann .83Hz Can offset the frequency of the negative interference of electromagnetic waves and radio waves, so that the sound space reverberation is stable and harmonious, so that listeners can enjoy music more physically and mentally and relax the body, improve the perception of sound and images, The health of the human body improves the efficiency of work creation and has a good effect on insomnia and mental stress. Schumann wave: Helps to sleep, helps to improve the taste of wine, tea, and water! Relieve stress. 3 color , 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 inspiration, For the office-relax and improve productivity. Product Usage Tips: It is recommended to place the product at a height of 1.5 meters 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 meters. Item Type:Schumann Generator Product name: Schumann wave extremely low frequency pulse 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: 3 x Generator 3 x USB cable 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.