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: 155x105x26MM(With shell)Weight: 300g(With shell)Product List:1pc x Healflux Custom Frequency Generator V2 (with acrylic shell)1pc x USB cable Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store