Use it for: Instant relaxation, deeper meditation, improved sleep, and imprinting frequencies onto objects. How to Use: – Plug the device into a wall socket, laptop, or power bank using the provided USB-C power cable. – Connect headphones to the device or connect the device to a speaker using an AUX cable. – Enter the desired frequency using the touchpad on the device. – 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 ~ 30000Hz, pure sine wave Signal voltage amplitude: 3V With 3.5mm audio output With acrylic shell Size: 155 x 105 x 26mm (with shell) Weight: 300g (with shell) Product List: 1pc × Custom Frequency Generator V2 (with acrylic shell)