1. Integrated power switch, making it easier to turn on and off the power, eliminating the need to plug and unplug the charging port every time you use it 2. Dual power port design, no longer worrying about incorrect data cable interfaces 3. Unique addition of TVS static protection and short circuit protection on the board, safe and reliable 4. Imported chips are used for more stable frequency and pulse width 5. Added a power switch, turning it to the ON position to turn on the power and the OFF position to turn off the power Schumann wave generator Power supply voltage: 5V 1. Imported chips are used for more stable frequency and pulse width 2. Double layer FR-4 1.2T-PCB board, with stable and more reliable PCB quality 3. Increase the emission coil, enhanced 28 coil emission coil, and increase the emission range 4. The board supports two power interfaces: TYPE C (supports forward and reverse insertion) and USB Micro, so you no longer need to worry about finding different charging cables 5. protection circuit, adding high-power TVS electrostatic protection tube to prevent hand and air static electricity from damaging the chip. 6. Add a PPTC self recovery fuse to prevent the power supply of the board from being completely cut off after a short circuit occurs. When the short circuit is resolved, the fuse automatically returns to normal, making use safer and more reassuring. 7. Added a power switch, turning it to the ON position to turn on the power and the OFF position to turn off the power. Note: It does not come with a USB power cord. You can use a Type-C universal mobile phone power cord to plug into the interface to power on. It can be used when the indicator light is on. No adjustment is required. Colour:black+silver Material:PCB+Metal Package Contents: 1 x Schumann