This Boss MG-10 is a gently used guitar practice amp from the 1990s. It has solid-state electronics, a closed-back design with a front-facing port, and pushes 10 watts at 4 ohms to two Roland-designed 5-inch speakers. It shows few signs of wear and works much better than you would expect considering it's age.
The amp's Warp Mode adds body to your sound and produces a thicker distortion level. The Warp Mode is controlled by the Bass tone pot.