This is a used unit on good working condition.  It has two spots of discoloration on one side - please see pictures.

The Sound Storm EV400.4 4-Channel 400W Amplifier is a powerful and versatile car audio component designed for enhancing your vehicle's sound system. With its 400W RMS power output and 4 channels, this amplifier is capable of delivering clear and impactful audio for an immersive listening experience. The Sound Storm brand is known for quality and reliability, making this amplifier a popular choice for car audio enthusiasts looking to upgrade their audio setup. Whether you're looking to power a full sound system or simply want to add some extra punch to your current setup, the EV400.4 is a solid choice for audiophiles on the go.