Schumann Wave Generator Signal 7.83hz Ultra-low Frequency Pulse With Rechargeable Battery

Description

USB charging, no longer have to worry about power shortage. With overcharge, overvoltage, overcurrent protection. make you comfortable. It can effectively improve sleep quality, relieve insomnia and relieve fatigue. Made of acrylic and electronic components, durable and not easy to break. Length 68mm, width 52mm, height 12mm, easy to carry and use.