Yamaha PSS-A50 37 Key Mini Keyboard / Midi Controller A50

Width: 506 mm (19-15/16")
Height: 54 mm (2-1/8")
Depth: 201 mm (7-15/16")
Weight: 1.2 kg (2 lb, 10 oz) (not including batteries)
Control Interface
Keyboard: Number of Keys 37
Type: HQ mini (High-Quality mini)
Touch: Response Soft, Medium, Hard, Fixed
Polyphony: Number of Polyphony (Max.) 32
Preset: Number of Voices 40 Voices + 2 Drum Kits
Effects
Functions: Panel Sustain
Arpeggio: 138 types
Types: Miscellaneous Motion Effect (34 types)
Recording: MIDI data, Number of Phrases: 1 (Approx. 700 notes; fewer when recording using effects such as Motion Effect)
Overall Controls: Metronome
Tempo Range: 11 - 280, Tap Tempo (32–280)
Octave Button: -04 to +04
Transpose: -12 to 0, 0 to +12
Tuning: 427.0 - 440.0 - 453.0 Hz (Approx.0.2Hz Increments)
Connectivity
Headphones: Stereo mini jack (PHONES/OUTPUT)
USB TO HOST: Yes (MIDI, USB micro B)
Amplifiers: 1.4 W
Speakers: 8 cm x 1
Power Consumption: 1.5 W
Auto Power Off Function : Yes
Adaptors: USB power adaptor 5 V/500 mA (Sold separately)
Batteries: Four “AA” size alkaline (LR6), manganese (R6) or Ni-MH rechargeable (HR6) batteries
Accessories
Included Accessories: Owner’s Manual, USB cable, Online Member Product Registration