Casio CTK-2400 Specifications:

• Keyboard 61 standard-size keys
• Midi: GM level 1 Standard
• Touch Response: No
• Key Light System: No
• Maximum Polyphony: 48 notes
• Tones: Built-in Tones: 400
• Sampling: Tones:1
• Sampling time: 1 second (fixed)
• Effects: 10 types (for Full Sampling samples)
• Reverb: 10
• Metronome: Beats per Measure: 0,2 to 6
• Tempo Range: 30 to 255
• Song Bank: Tubes 110
• Sampling Function: Maxium Sampling Time 2 Sec. (Long Sampling Mode) 1 (Long Sampling) or 5 (Short Sampling) tones/ Data Back up
• Sampling sound: Built-in Mic/ Mic In
• Variety: 26 (1 Long Sampling, 5 Short Sampling, 10 Effects for Long Sampling and 10 Effects for Short Sampling) 
• Music Challenge: 20 notes
• Auto Accompaniment: Rhythm Patterns: 150
• Other Functions: Transpose: +/-1 octaves (12 semitones)
• Tuning: A4 = approx. 440 Hz +/- 100 cents
• MIDI: 16 multi-tune received, GM Level 1 standard
• Musical Information Function : Tone, Rhythm, Song Bank, numbers and names; staff notation, fingering, pedal operation, tempo, measure and beat number, chord name, etc. 
• USB port : Yes (To Host)
• Sustain jack: Standard jack (sustain, sostenuto, soft, rhythm start/stop)
• Phones/Output jack: Stereo standard jack
• Output Impedance: 40 kOhm, Input Sensitivity: 200 mV
• Mic In jack: Standard jack
• Input Impedance: 3 kOhm, Input Sensitivity: 10 mV
• Power Jack: 9V DC
• Power Supply: 9.5V DC (AD-E95100L)/ 6 AA-Size Batteries
• Batteries: 6 AA-size zinc-carbon batteries or alkaline batteries
• Battery Life: Approximately 3 hours continuous operation on alkaline batteries
• AC Adaptor: AD-E95100L
• Auto Power Off: Approximately 6 minutes after last key operation (Operates during battery use only)
• Speakers 10cm X 2
• Power Consumption: 9V – 7.7W
• Dimensions: 94.6 × 30.7 × 9.2 cm (37 1/4 × 12 1/16 × 3 5/8 inch)
• Weight: 7.94 lbs (without batteries)