Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si Features: This product is Schumann .83HZ low frequency generator, features high accuracy and stability.High stable frequency acquisition : high stability pulse chip, precision correction capacitance, precision multi-loop adjustable resistor.High quality polymer batteries, with overcharged, over voltage, overcurrent protection. There is no voltage ripple in the voltage supply.With work toggle switch, easy to use.Schumann wave can be applied to HIFI or sleep.Specification:Power: 12V 1A android charging cablePolymer battery capacity: 2300mahWorking time: 200 (full of electricity)Size:132x108x30mmWeight: 200gSchumann wave applied to sleep:1. It is recommended to buy a trial, on a bedside, more than 1 meter from the human body distance.2. The trial, plus the appropriate weight for anti-vibration treatment.3. The appropriate use of paper cloth cloth block indicator light, remove the product at night light4.Try it for a week and analyze seven of experience.Material: Plastic+metalcolour: As shownPackage Contents:1 x Ultra-low frequency pulse generatorOnly 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 +/- 1-3cm.