[Best Bluetooth Speaker Ever] Boom&Tech&reg; Roar Wireless Bluetooth Speaker for Computers & Smartphones - Bluetooth CSR 4.0 with Built-in Speakerphone and 8 Hour Rechargeable Battery Wireless Bluetooth Speaker - Advanced CSR 4.0 Bluetooth Technology Well-balanced sound profile featuring a rich bass that can fill any room or outdoor space Water-Resistant & Dust-Proof Bluetooth Speaker (IP54) Built-in mic & speakerphone Built-in hands free microphone: Great for driving and when on the move. Long-lasting 8 hour playtime