This Trolley Speaker is a perfect choice for small to medium sized events. It is easy to transport and set up with its built-in wheels and handle. The speaker has a power output of 40 watts RMS and features a built-in USB MP3 player, Bluetooth connectivity, FM radio, and aux input. The speaker also has a recording function so you can record your voice, speech, or songs to a USB or SD card. The trolley speaker also features a stylish design with a black finish and silver trim.