Use for: relaxation, meditation, sleep support, frequency output to 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 to a speaker using an AUX cable. Enter the desired frequency using the touchpad. Press OK. Specifications: Working voltage: DC 5V (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 audio output Housed in acrylic casing Dimensions: 155 x 105 x 26mm (including casing) Weight: 300g (including casing) Package includes: 1 x Frequency Generator Device (with acrylic casing) 1 x USB Cable