SoundBlock Custom Bluetooth Wireless Stereo Speaker for Computers and Smartphones. Bluetooth 3.0 Technology with Built-in Speakerphone and 10 Hour Rechargeable Battery. In Red/White New Bluetooth 3.0 Technology allows you to connect wirelessly to the Soundblock from up to 33 feet away. Seamlessly stream and share music, movies, games, phone and conference calls anywhere.Easy to pair - No code/pin needed. Premium Sound with Bass Enhance Technology. Two powerful 40mm Drivers deliver crisp clean sound with deep bass Built-in Li-Ion Rechargeable Battery for up to 10 hours of playtime. Built-in microphone for hands-free speaker phone calling Built-in Li-Ion Rechargeable Battery for up to 10 hours of playtime. Built-in microphone for hands-free speaker phone calling For a choice of colors search SoundBlock CUSTOM (on amazon) and choose from 36 color variations.