Tmvel Masti Portable NFC Wireless Bluetooth 4.0 apt-x 10 Watt Powerful Sound Speaker with Built-In Speakerphone & Sub-woofer Sound Effect,Black New Bluetooth CSR V4.0 apt-x Technology allows you to Connect wireless up to 33 feet away. Seamlessly stream and share music, movies, games, phone and conference calls anywhere. High capacity 1800 mAh polymer Li-ion rechargeable battery supports up to 10 hours playing time! Modular "Buddy-Jack" function allows you to Connect a row Speakers to get jaw-dropping Loud Sound. Make and receive phone calls with the built in HQ Mic. Two highly powerful 40mm total 10W acoustic drivers and ultra-small size produce a wide audio spectrum.