The product is a 0.83 HZ Schumann ultra-low frequency generator, with high precision and stability.
Stable high-frequency acquisition elements: high stability pulse, precision correction capability, resistance adjustable multi-loop precision.
High-quality polymer batteries, with overcharge, overvoltage, and overcurrent protection. There is almost no voltage ripple in the power supply. With working rocker switch, easy to use. The Schumann wave can be applied to HIFI or for sleeping.

Power supply: 12 V 1 A Android charging cable
Polymer battery capacity: 2300 mah
Operating time: 200 days (full of electricity)
Material: Metal
Color: black

Package contents:
1 x ultra-low frequency pulse generator

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 +/- 1-3 cm.