Schumann Signal 7.83Hz Low Frequency Pulse Generator Improves Sound Quality

1. Battery powered, no voltage ripple, more accurate output frequency 2. Polymer lithium battery with overcharge/overdischarge/overcurrent protection 3. Small size, easy to use, good effect 4. Power supply: 5V Micro USB interface charging cable 5. Battery: lithium polymer battery, capacity 850mAh 6. Charging current: 250mA 7. Working current: 7mA 8. Charging time: about 6 hours fully charged 9. Use time: about 200 hours 10. Size: about 6.8x5.2x1.2cm