This item is a Marshall MB15 bass amplifier, and it comes with the instruction manual. Although it's the smallest model in the series, the powerful sound that comes from the 1x8" speaker is almost astonishing. It's packed with features, including two channels, a compressor, and an emulated line out & headphone jack. Not only is it the best entry-level model, but it also boasts outstanding cost performance as a second amplifier for advanced players. Operation has been confirmed. The back part is slightly peeling. Please check the photos. Thank you. #Marshall #Marshall #MB15