Casio KS21 Portable Keyboard With 49 Keys, CTK-240

Keyboard : 49 full-size keys
Maximum Polyphony: 12
Tones : 100 built-in tones
Rhythms/Patterns : 100 built-in rhythms
Auto Accompaniment Modes: CASIO Chord, Fingered
Controllers: Start/Stop, Synchro/Fill-in
Built-in Songs : 50 (Song Bank)
Lesson Function : Melody on/off (Lesson part: Melody part)
Other Functions : Song bank controller
Key Transpose : 12 steps (-6 to +5 semitones)
Tuning Control A4 = approximatery 440 Hz ± 50 cents
Display Screen : LCD
Speakers : 10cm x 2
Amp Output : 1.6W?1.6W
Input/Output Terminals : Headphones/output (standard stereo jack)
External power (9.5V DC)
Batteries: D-sizex6/Optional AC adaptor: AD-E95100L(LAD-6)
Dimensions (W x D x H) : 914 x 237 x 75mm