There's a small amount of cosmetic wear that is all shown in the pictures. Someone wanted to write on it with marker for some reason. It is wrapped in plastic to stay preserved for you! Here's a description from equipboard.com:

The Boss KM-2 Mixing Amplifier is a versatile piece of equipment that bridges the gap between a mixing console and an amplifier, providing musicians with a unique tool for shaping their sound. Designed originally in the 1970s, this compact device has found a niche among guitarists and other musicians who appreciate its retro charm and practical utility. With its straightforward interface, the KM-2 allows users to blend multiple sound sources effortlessly, offering distinct control over various audio signals.

Featuring two channels, the KM-2 is particularly adept at handling multiple inputs, making it ideal for small bands or solo performers who need to manage several audio sources simultaneously. Each channel comes equipped with its own level controls, letting you fine-tune your mix with precision. The integrated tone control further enhances your ability to sculpt your sound, providing a range of tonal options to suit different musical styles or performance environments. Notably, its built-in reverb adds depth and warmth to your audio, enhancing the overall listening experience.

The Boss KM-2 is not just another mixer; it's a gateway to vintage sound aesthetics with a modern twist. Its solid construction ensures durability, while its compact size makes it easy to transport and integrate into your existing setup. Whether you're performing live or recording in the studio, this mixing amplifier delivers reliable performance with a touch of nostalgic flair.

Key Features:

• Two-channel mixing capabilities with individual level controls
• Integrated tone control for versatile sound shaping
• Built-in reverb for added depth and warmth
• Compact design for easy portability
• Durable construction for long-lasting use