The WAE BTP04 is perfect for enjoying all of your activities and outdoor adventures with your favorite music! Your music will follow you anywhere, without missing a beat: at the skate park, at the beach, on your bike trips, while you’re skiing! This single-unit Bluetooth 2.1 + EDR (A2DP) stereo speaker is compatible with Bluetooth devices including mobile phones and smartphones, tablets, and computers (Windows Vista/7/8, Mac OS X). The built-in lithium ion battery provides more than 10 hours of continuous play. The two active wideband drivers, plus one passive bass-amplifying driver provide excellent audio clarity. Rubber end-pieces provide enhanced shock resistance, and a double protective grille covers the drivers. A built-in microphone lets you enjoy Hands-Free calling. You can easily connect multiple WAE Outdoor BTP04 speakers to one another, using the included USB cable.