A. Purpose: Instant relaxation, deep meditation, improving sleep, imprinting frequencies onto objects B. Usage method: - Plug the device into a wall socket, laptop, or power bank using the included USB - C power cord. - Connect the headphones to the device or use an AUX cable to connect the device to a speaker. - Use the touchpad on the device to enter the desired frequency. - Press "OK". C. Specification parameters: - Operating voltage: DC 5V (DC 4 - 15V) - Operating 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 - Equipped with a 3.5mm audio output - Has an acrylic shell - Dimensions: 155 * 105 * 26mm (including the shell) - Weight: 300g (including the shell) D. Product list: - 1 Healflux Custom Frequency Generator V2 (with acrylic shell) - 1 USB cable