Battery Operated With Timer: This battery lamp is operated by 2*AAA batteries(Not include), therefore it is a portable way to light corners or bathroom without outlets, wireless battery lamps are very easy to use and maintain. You dont have to worry about the power supply to get the light!Meanwhile, they have timing function. The Timer is 6 hours on, 18 hours off, which is very convenient for lazy daily use! No need to turn on or turn off the lights frequently