As you asking I am telling about Casio WK-3800 - Workstation Keyboard product , it includes 76 Full-Size keys, 32-note Polyphony, Touch Sensitive, Genernal MIDI, USB Port, Sequencer, 894 Tones, 182 Rhythms, DSP/Reverb/Chorus/EQ Digital Effects, SD slot, Sound,Rhythm and Song expansion by Internet download, Backlit LCD, New Advanced ZPI Chip, Larger Internal memory, CD Rom and AD-12 Power Supply Included, Pitch Bend and Modulation Wheels, Line In/Out, FDD.

Casio WK-3800 Keyboard features

Keyboard 76 keys with touch response (OFF/1/2/3)
Tones 400 Advanced Tones + 200 Preset Tones + 20 Drum Sets + 100 standard user tones + 20 user tones with waves*1 + 4 user drum sets with waves*1 + 50 drawbar organ tones + 100 user drawbar organ tones (894 tones total); layer/split
Polyphony 32 notes maximum (10 for certain tones)
Drawbar Organ Function Drawbars
9 (16', 5 1/3', 8', 4', 2 2/3', 2', 1 3/5', 1 1/3', 1')
Percussion Second, Third
Click On, Off
Effects DSP (200 types: internal, 100 user areas) + Reverb (16 types) + Chorus (16 types) + Equalizer (10 types, 4 bands)
Auto Accompaniment Rhythm Patterns 182 (internal, 16 user areas*1)
Tempo Variable (226 steps, ♩= 30 to 255)
Chords 3 fingering methods (Casio Chord, Fingered, Full Range Chord)
Rhythm Controller Start/Stop, Intro/Ending 1 and 2, Variation/Fill-In 1 and 2, Synchro/Fill-In Next
Accompaniment Volume 0 to 127 (128 steps)
One Touch Presets Recalls settings for tone, tempo, layer on/off, and harmonize on/off in accordance with rhythm
Auto Harmonize 10 types: Automatic addition of notes that harmonize with melody note in accordance with specified Auto Accompaniment chords
Memory Function Songs 5
Recording Tracks 6 (2 through 6 are melody tracks)
Recording Methods Real-time, step
Memory Capacity Approximately 10,000 notes (total for 5 songs)
Edit Function Equipped
Demo Tunes 3
Registration Memory Number of Setups 32 (4 setups x 8 banks)
Memory Contents Tone, Rhythm, Tempo, Layer on/off, Split on/off, Split point, Harmonize on/off, Mixer settings (Channels 1 to 10), Effect settings, Touch Response settings, Assignable jack setting, Transpose, Tuning, Accompaniment volume setting, Pitch bend range, Auto Harmonize type MODE button setting, Synchro standby state, Mixer Hold, DSP Hold, Synthesizer Mode parameters
MIDI 16 multi-timbre receive, GM Level 1 standard
Other Functions Pitch Band Range Adjustable (12 semitones upwards and downwards)
Modulation Equipped
Transpose 49 steps (-24 semitones to +24 semitones)
Tuning Variable (A4 = approximately 440Hz +/- 100 cents)
LCD Adustable contrast
SMF SMF Player Flash memory storage for up to 200 files*1
Supported Format SMF0
Flash Memory Capacity 4MB*2
Shared Area Approximately 3.5MB*2 (waveform data, accompaniment data, SMF data)
Further storage of waveform, accompaniment, and SMF data becomes impossible after teh total of such data reaches approximately 3.5MB.
SD Memory Cards Supported SD Memory Cards 1GB or less (Cards with capacity greater than 1 GB are not supported)
Function Save and load of user tones, user songs, and registration data; playback of SMF; card formatting; file delete; file rename
Floppy Disk Drive Type 3.5" FDD
Formats 2DD (720KB MS-DOS format)
2HD (1.44 MB MS-DOS format)
Functions Save and load of user tones, user songs, and registration data; playback of SMF; disk formatting; file delete; file rename
Terminals SD memory card slot
USB Port Type B
Sustain/Assignable Terminal Standard jack (sustain, sostenuto, soft, rhythm start/stop)
Headphone/Output Terminal

Stereo standard jack
Output Impedance: 200Ω
Output Voltage: 250mV (RMS) MAX
Line Out (R, L/Mono) Stereo jack x 2
Output Impedance: 3k Ω
Output Voltage: 1.5V (RMS) MAX
Power Supply Dual power supply system
Batteries 6 D-size batteries
Battery Life Approximately 4 hours continuous operation on alkaline batteries
AC Adaptor AD-12
Auto Power Off Turns power off approximately 6 minutes after last key operation. Enabled under battery power only, can be disabled manually
Speaker Output 6.1W + 6.1W
Power Consumption 12V...18W
Dimensions 48 3/16 x 16 11/16 x 6 5/16 inch
Weight Approximately 22.0 lbs (10.0kg) (without batteries)