Features: Experience enhanceds relaxation and improved sleep quality with our Schumann Resonances Generator, featuring a precise 7.83Hz sine Waves generated by intelligent chip. for efficiency, this low frequency pulse generator operates at minimal power consumption of 5V 0.08A, ensuring long performances. for both men and women seekings to improve their sleep pattern and overall well being through natural frequency therapy. for use in bedrooms, meditations space, or work where a calming atmosphere is desired. from ABS materials, this device includes USB A connection for external 5V power supply, making it addition to your accessories. Specifications: Materials: ABS Size:80x76x24mm/3.15x2.99x0.94inch Package Includes: 1Set 7.83HZ Schumann Waves Generator with Cable note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the picture may not reflect the actual of the item. Thank you!