The Taf Toys Stereo Butterflies Mobile is a celebration of movement, light & soothing melodies & is designed to calm the smallest of babies. The simple attachment mechanism makes it easy to fit to most cots & the whole mobile can be turned for access to baby. 27 min. of music 7 classical melodies andamp; nature sounds Detachable music unit 2 speakers sound system Colorful light show Light, mute andamp; movement control Sturdy design & structure Easy 4 step assembly age: 0m+ Batteries: AA x 4