V-Sound - bi-directional drivers for direct and reflected sound Power bass–integrated powered subwoofer for real bass response Designed for portability with integrated handle USB device charging for your mobile device Bluetooth audio streaming for untethered wireless freedom Indoor and outdoor EQ modes for optimized listening in any space Water-resistant all weather design for outdoor use 3.5mm stereo analog input to connect any audio source 3.5mm microphone level input makes the Blaster a portable PA system Battery life LED display indicates charge level Up to 12 hours of continuous play w/awesome bass