Portable Party Speaker (BTC) Brand: BTC For Sound Systems. Operates with Bluetooth technology. Features a top control panel for volume and playback control. Supports media playback (likely USB and SD card/FM if available). Suitable for parties, gatherings, and trips. Top horn design for good sound dispersion. Black color with a front design and red lighting. Used condition and works efficiently. Notes: Requires a power cable, available at electronics stores.