1. 7.83Hz Ultra Low Frequency: The ultra low frequency pulse generator adopts control chip, specific 7.83Hz ultra low frequency wave, the frequency is stable.2. Main Functions: Beneficial to the of water, relieve fatigue and pressure, sleep, and mental health, and reduce surrounding electromagnetic radiation.3. With Power Cable: The ultra low frequency pulse generator comes with a USB power cable, which can be directly plugged into a 5V, 0.5A power supply to use.4. ABS Made: The housing of this pulse generator is made of ABS material, which has high strength, not easy to , has good durability for long term usage.5. Applicable for: This is suitable to use glass, porcelain, iron, etc. to hold water, aluminum, copper and other products cannot be used, which cannot let the low frequency of 7.83HZ pass through the container.Item Type: Schumann Wave GeneratorInput Voltage: DC5V 0.5AOutput Power: 2.5WOutput Frequency: 7.83HzFunction: Help to sleep quality, water activity, water, resist external electromagnetic radiationColour:white+blackMaterial:ABSPackage Contents:1 x Generator1 x USB cable(random colors, 't accept the specified color)Only 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.