Support USB 5V voltage input, can be used as power supply adapter, power bank, computer USB port etc Supports double channel signal input and amplifier output at 1.25-4p intervals Driver board, automatic recognition, automatic conversion 3.5mm headphone port for sound output and can be used to connect regular 3.5mm headphones or external amplifier devices The potentiometer uses a button and features a 3-inch function to combine brightness, Manufacturer: Uitndvyte