The RL20 is a complete fill-in lighting kit, specially designed for live streaming, video chat, tutorials, make-up and taking professional selfies. The kit supports 3 lighting modes (warm light / cold light / warm and cold mixed light) and 10 levels of adjustable brightness to meet your different photography light needs. The LEDs are USB-powered and can be connected by computer, power bank or a 5V power adapter conveniently. (not included) The rotatable head and various mobile phone holders make this set super flexible in use.