MX Trolley Type PA Personal DJ System also known as Rechargeable Portable Amplifier 15" Multimedia Speaker with Remote Controlled 1 Wireless Microphones rendering High Volume & power output of 75 W with an inbuilt speaker & battery, AC/DC operation, high-frequency FM receiver, LED display, USB/AUX functions & Guitar Input. Introducing MX Audio trolley speakers with Bluetooth, SD Card, USB connectivity, FM Radio features. It is useful for birthday parties, Class rooms, karaoke singing, Clubs & Resorts, Banquet Hall, Religious Places/ Halls and many more indoor / outdoor functions / get to gathers. You can also use MX Aux cable with any audio/video device. You can also connect your guitar and wired mic with it. It has up to 3 hours battery backup. You can also charge this speaker with your car 12V battery. You will get 2 wireless microphone free with this speaker.