Portable Wireless Bluetooth Speaker for Computers & Smartphones - Bluetooth CSR 4.0 Technology with Built-in Speakerphone and Rechargeable Battery - Unique Design and Aluminum Shell (Black) *Save Electricity and Fast Connection* Bluetooth 4.0 and CSR chipset connects faster, more stable and more efficient in power saving, compatible with all your Bluetooth-equipped devices. *360 Omni-directional Audio* Fills the room with immersive, 360 omni-directional audio?the speaker cone make sound more uniform, bass resonance deliver rich and comfortable listening experience. *Audio Line In Quickly Play* When the speaker off, the playback device to connect to speakers via 3.5mm audio cable, speakers will automatically turn on and play music. *Unique Design and Aluminum Shell* Unique and stylish design and aluminum shell with potent speaker driver to deliver enhanced music. *Hands Free Calls* Built-in noise reduction microphone for hands-free speakerphone use. Premium drivers for both active outdoor and indoor use.