Use for instant relaxation, deeper meditation, improved sleep, and frequency imprinting on objects. How to use: Plug the device into a wall socket, laptop, or power bank using the included USB-C cable. Connect headphones to the device or connect the device to a speaker using an AUX cable. Enter the desired frequency using the touchpad and press OK. Specifications: Working voltage: DC 5V (DC 4-15V) Working current: 9-14mA Power interface: Type-C (supports Type-C to Type-C power supply) Default frequency: 7.83Hz Adjustment range: 0.01Hz to 30,000Hz, pure sine wave Signal voltage amplitude: 3V Equipped with 3.5mm output Acrylic shell enclosure Dimensions: 155 x 105 x 26mm Weight: 300g Package includes: 1 x Custom Frequency Generator V2 (with acrylic shell) 1 x USB cable