From Yamaha Wiki

The Yamaha PSR-248 is an entry-level portable musical keyboard produced by the Yamaha Corporation.

Features

• 100 different voices
• 100 preset songs
• 100 styles
• 61 keys
• MIDI input and output ports
• Footswitch input
• PHONES/OUTPUT jack for headphones or AUX out(anything plugged in disables built-in speakers
• Powered by six "D" size batteries or external 10-12VDC source

External links

• Yamaha PSR-248 page at manufacturer's site