Schumann Wave Generator Electromagnetic Version 7.83hz Ultra-low Frequency Pulse

Description

This product is a Schumann wave 7.83HZ extremely low frequency generator with high precision and good stability. High-stable frequency acquisition components: high-stable pulse chips, precision correction capacitors, and precision multi-loop adjustable resistors. High quality polymer battery with overcharge, overvoltage and overcurrent protection. The supply voltage has almost no voltage ripple. With working toggle switch, easy to use. Schumann waves can be applied to HIFI or sleep.