FrogEye BT-S7-7 HotBox S7+, Wireless Speaker and Power Bank-Silver Two powerful Hi-Fi drivers and an acoustic resonance box deliver superior soundquality Wirelessly stream audio from any Bluetooth device, plus a 3.5mm input for making direct connections High capacity rechargeable battery provides up to 18 hours of continuous playtime Convenient USB port for charging devices on the go Built in microphone for crystal clear speakerphone functionality