Cooligg Portable Home Wireless Bluetooth Speaker W/ 3D Surround Stereo Sound & Full Metal Housing DSP ENHANCED SURROUND CHIP - Advanced 3D suround and subwoofer stereo audio performance delivers a full-range listening experience FULL METAL CASE - Most compact and best Bluetooth speaker with full metal housing and intelligent body with high infinite, creative designed LATEST BLUETOOTH - Latest CSR Bluetooth 4.0 technology,can be easily and quickly paired with all bluetooth-enabled devices HIGH CAPACITY BATTERY - Built-in high capacity rechargable battery plays wirelessly whenever you play up to 8hours HANDS-FREE CALLS - Built-in microphone for picking up calls