Each lamp has 3 settings. Constant On, the lamp stays on and you can adjust the brightness by touching it. Off, the lamp is switched off. 30 minute timer, the lamp stays on for 30 minutes and then switches off automatically. During this time, the brightness can be adjusted by touching it. On the base of the lamp there is a charging indicator. Charging: light on. Fully charged: light off. USB-C type- Do not use the lamp while charging. Use only the supplied cable. Rechargeable lithium LED unit. DC5V 0.5A. 1200mAh/3.7V. Colour temperature 6500k. The lamp can also be used as a mobile phone holder by resting the device on the legs and the lamp body.