A500+ is an Amiga computer, basically a extended version of A500.

It came bundled with:

Commodore created the A500+ for a couple of reasons. The first was cost reduction; minor changes were made to the motherboard to make it cheaper to produce. It was also so that Commodore could introduce the new version of the Amiga Operating system, 2.04.

The plus was released almost in secret; many users didn't realise they weren't purchasing anything other than a "normal" A500. Due to the new Kickstart, quite a few popular games failed to work on the A500+, and a lot of people took them back to dealers demanding an original Kickstart 1.3 A500.