Stable and Reliable - Ensures stable frequency output with default 7.83Hz and voltage amplitudes of 3V suitable for sinusoidal and 5V. Multiple Wave suitable forms - Provides sinusoidal, and inverted options suitable for versatile applications. Promote Relaxation and Well Being - Emits a sinusoidal that creates a relaxing environment. Advanced Specifications - Powered by a USB interface and boasting a frequency of 7.83Hz, our Generator is less than 1W of rated power, which ensures efficient utilization of energy. Compact and Convenient - Compact size of 10.2x8.1cm and USB powered suitable for easy carrying and use or while traveling. suitable for the bedroom To help sleep soothe the nerves, treatment of insomnia. suitable for the office Relax and improve work efficiency. suitable for the Resting body and mind. Colour:As Shown Material:pcb Package Contents: 1 * Pulse Generator(Not a finished product, needs assembly) 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.