Junjiada Bluetooth Speakers Stereo 20W Speaker (Dual 10W Drivers, Dual Passive Subwoofers, Strong Bass, Aluminum-Alloy, Bluetooth 4.0, Built-in Microphone) Wireless Portable Speaker Features two 10W speaker, 20-watt (total) drivers and a large speaker cavity for excellent sound. Built-in 4000mA Rechargeable Battery for up to 20 hours of playtime. Built-in microphone for hands-free speaker phone calling Easy to pair - No code/pin needed Quick pairing through Bluetooth with iPhone, iPad Mini, iPad 4/3/2, iPod, Blackberry, Nexus, Samsung and other popular smartphones. Plays all Audio devices through 3.5mm Aux in Jack. Equipped with the advanced Bluetooth 4.0 technology, compatible with all Bluetooth-enabled devices (Bluetooth V2.1 and over).