Monoprice Mini Bluetooth Party Speaker Bluetooth - you can stream music from your smartphone or tablet to the speaker system using a wireless Bluetooth connection USB - you can plug a USB flash drive with mp3 and/or wma files into the USB port This portable speaker system is designed to serve as both a music source and a PA system. Wired - you can connect a line level input into the 3.5mm TRS jack or into the two RCA jacks A 1/4" microphone input allows you to connect a standard dynamic microphone for MC duties.