Denver TSP-300 is a versatile trolley speaker with a built-in battery that allows you to enjoy your music anywhere. It features a 12" and 3" speaker, providing clear and powerful sound. With multiple input options including Bluetooth, USB, Micro SD, and AUX, you can connect various devices and play your favorite music. It also has a recording function, allowing you to capture and playback your own audio. The speaker comes with a remote control for added convenience, and its compact and portable design makes it easy to take with you wherever you go.