Features 【MAIN PURPOSE】Wireless schumann generator Help people relax physically and mentally, improve perception of sound and images, reduce stress, and improve work efficiency. 【7.8HZ GENERATOR】Ultra low frequency Schumann wave generator, pulse resonant frequency 7.8Hz (adjustable), with high accuracy and good stability. 【LARGE CAPACITY BATTERY】Chargable Schumann Wave Generator can be used after charging, the rechargeable large capacity lithium battery can last for about 400 days after being fully charged. 【UNIVERSAL and EASY to USE】USB-C charging port, universal for most device, wireless schumann wave generator adopts highly stable pulse chip, precise correction capacitor and precise multiple loop adjustable resistor, with high reliability. 【GOOD PERFORMANCE】The schumann wave generator adopts excellent PCB components to ensure stable performance, less interference and longer service life. <strong>Specification:</strong> Item Type: Schumann Wave Generator Material: PCB Resonance Frequency: 7.8Hz (Adjustable) <strong>Package List:</strong> 1 x Schumann Wave Generator Package List 1 x Schumann Wave Generator