Thunder Bass, which we all guessed, is an amp head for bassists. Based on the Ampeg SVT, Hotone somehow got all the big thunderous sound into a mini-sized amp. Whether you are the bassist in the spotlight or the one keeping the pulse in the shadows, this solid amp will suit. Flexible and dynamic, it's as stable as the most stable member of the band. Features include: · Extremely compact configuration for portability · High quality tone with Volume and Gain controls · 3 Band EQ controls for shaping your tone ·Speaker out can automatically fit cabinets of different impedances (4-16) ·¦FX LOOP for using external effects ·¦Headphone output jack is very convenient for practicing and recording ·¦Aux In jack can let you play with an external music player ·¦18V DC power supply (Adapter included) ·¦Power Output: 5 Watts ·¦Dimensions: 128mm (W) x 75mm (D) x 59.5mm (H) ·¦Weight: 440 g