USB-MIDI: The key lighting system will help you easier to learn the keyboard. You can use the teaching APP on you computer or phone.
Key Lighting
61-Key Lighting Keyboard With Touch Function
LCD Display
460 Timbres / 260 Rhythms
65 Demonstration Songs / Keyboard Percussion
Master Volume / Chord Volume / Rhythm Volume Control
Single Finger / Fingered Chord / Chord Off / 4 Chord Mats 
Start/Stop / Sync / Fill-in / Metronome / Tempo Control 
Rhythm Programming Function / Record & Playback
Pitch Bend / Vibrato / Sustain / Touch / Key Lighting
Transpose Control / Tuning Control / Dual
Keyboard Split Feature
Memory / M1 / M2 / M3 / M4
One-key / Follow / Ensemble
USB-MIDI(APP) Jack / MIC Jack
Audio Input Jack / Phone/Output Jack
Product Dimensions: 971 x 379 x 140 (mm)
Power Supply: DC 12V / AC Adaptor