From Yamaha Wiki

The Yamaha PSR-500M is an entry-level portable musical keyboard produced by the Yamaha Corporation.

Features

AWm2 wavetable engine, 4 mb of recorded samples*99 different voices (output soundsets including Piano, Harpsichord, Clavi, Organ (music), Violin, Saxophone, Flute, and Clarinet.

• 98 styles(variations on the songs using various musical styles)
• A "one touch" setting which allows for song play on the touch of a key
• 61 keys, and 5 full Octaves

• Input and output ports for headphones, amplifiers etc.
• DC in. 10-12v port for plug.