Bluetooth V 3.0 +EDRClass 2， rang 33'(10m)Supports A2DP stereo profile3.5mm stereo inlet socketSleep mode for energy savingWireless music receiver connects to 3.5mm headphone jacksUse with home stereos/ speakers. car stereos， headphones etc.One touch connect button for easy device pairingUp to 8 hours music playback or continuousSize: approx.5.2cmx2.4cmx1cm/2.0''x0.9''x0.4''