The led galaxy light is a small light with a big personality simply switch it on and enjoy the awesome effect as stars are projected into your room battery operated the hypnotic galaxy light can be used as a portable light for parties or as a soothing mood light in your homer led colour changing and galaxy light effect project stars into your roombattery operated 3 x aa batteries requiredcan be used with a dc 45v 500ma adaptor not includedsize 11cm diameter x 12cm