USB Supplys 7.8Hz Schumann Waves Ultra-Low Frequency Pulse Generator

feature: Schumann resonance (SR) is a group of spectral peaks in the extremely low frequency (ELF) portion of the Earth s electromagnetic field spectrum. This Schumann wave generator has high precision and good stability giving you a better experience. Need to use by type-c cable to connect not included easy to use. You can use it at home to reduce insomnia or at the office to increase productivity. It has a wide range of uses. The operation is simple and it can be used directly after plugging in. Whether it is a novice or an amateur it can quickly get started. Specification: material: plastic Disc Diameter: 82mm / 3.2in Supply: Type-c port Resonant frequency: 7.8Hz (adjustable) Package size: 100*82*20mm/3.9*3.2*0.8in Package Weight: 18g/0.6oz Packing list: 1 * Schumann resonance generator notes: 1. Due to manual measurement please allow 1-3mm error. 2. Due to the difference of different monitors the picture may not reflect the actual color of the item. Thanks!