Use it for: Instant Relaxation Deeper Meditation Improved Sleep Imprinting Frequencies On to ObjectsHow to Use: Plug the device into a wall socket, laptop or power bank using the provided USB-C power cable. Connect some earphones to the device or connect the device to a speaker using an AUX cable. Type in the desired frequency using the touch pad on the device. Press Ok.Specifications:Working voltage: DC 5V (DC 4-15V)Working current: 9-14MAPower interface: Type-c(Support TYPE-C TO TYPE-C power supply)Default frequency: 7.83HzAdjustment range: 0.01Hz~30000Hz Pure Sine WaveSignal voltage amplitude: 3Vwith 3.5MM audio outputwith acrylic shellSize: 155*105*26MMWeight: 300gProduct List:1pc * Healflux Custom Frequency Generator V2 (with acrylic shell)1pc * USB cable