The SONOS PLAY:3 wireless speaker system has 3 dedicated digital amplifiers that are individually coupled with 3 integrated speakers for exceptional sound quality. This speaker system"s built-in wireless capability lets you play the same song in 3 different rooms. It maintains perfect synchronization while eliminating echoes and delays. With lightweight and powerful Class-D amplifiers, this Hi-Fi speaker system delivers Surround Sound without the hassle of wires. It"s compatible with both Windows operating systems and Mac OS X. You can also connect this speaker with Android phones, iPhones, iPod touch devices and iPads. Just download the free SONOS Controller apps for Androids, iPhones and iPads to control the music on your PC or laptop. You can set this all-in-1 music player on a table vertically or horizontally or mount it on a wall. No battery is required.