Jrifedptry 7.8Hz Wave Ultra-Low Frequency Pulse Generator Sleep Improver Circular Waves Generator for Home Office Easy Install Easy to Use

3. addition of static protection and short circuit protection on the board, safe and reliable 2. Dual power port design, no longer worrying about incorrect data cable interfaces 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 4. 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