&Eacute;coutec SK-3301 Lente Ultra-Portable Light Weight Bluetooth 4.0 Speaker with High Definition Sound for iPhone, iPad, Samsung, Nexus, HTC, Nokia, LG & More Designed in California smallest in its class yet powerful speaker out-perform other similar-sized portable speakers Bluetooth 4.0, A2DP/HFP/AVRCP, output power:3W, working distance:10m Built-in microphone for hands-free calls, led indication for charging state and pairing status Built-in 500mAh rechargeable lithium battery