Tested and working, no box. This is a classic bass preamp/DI box, beloved by bassists for many years. It provides a warm, tube-amp-like sound in various situations, including live performances, recording sessions, and home practice. 【Key Features and Functions】 Versatile Sound Shaping: From vintage tube tones to modern slap sounds and aggressive distortion, a wide range of sound creation is possible. Amp Simulation: Realistic amp sounds can be obtained simply by connecting directly to a mixer or recorder, without spending time on amp miking. DI Function: Equipped with a balanced output (XLR OUTPUT), it can be connected directly to a PA system or recording console. Blend Control: You can mix (blend) the direct sound of the instrument with the sound processed through the SansAmp circuit to achieve your desired sound quality. Power Options: Operates on a 9V alkaline battery, a DC9V power supply, or phantom power from a PA mixer. Durable Enclosure: A robust all-metal construction that can withstand the rigors of the road.