RICH Schumann Wave Generator 783Hz UltraLow Frequency Pulse Generator with Screwdriver and USB CableUSB Rechargeable for Bedroom Home68x52x12 mm

Ultra-low Frequency Pulse Generator, DC5 V 7.83hz Schumann Wave Generator High Precision Digital Signal Source Generator Features: USB rechargeable, no worry about its electricity shortage anymore. With overcharged, overvoltage, overcurrent protection. Make you comfortable. Can effectively improve sleeping quality, relieve insomnia, relieve fatigue. Made of acrylic and electronic components, durable and not easy to break. 68mm long, 52mm width, 12mm high, easy to carry and portable to use. Specifications: Material: Acrylic+Electronic Components Color: White Size: About 68x52x12 mm(L*W*H) Voltage: 5 V Battery: 1400 mAh rechargeable battery(Built-in) Power supply: USB rechargeable Interface: Micro-usb Charging current: 250mA Charging time: About 6 hours(fully charged) Working current: About 7mA Working time: About 200 hours(fully charged) Package Included: 1 pc*Schumann Wave Generator(Built-in1400 mAh rechargeable battery) 1 pc* Screwdriver 1 pc*USB Cable Note: 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.