M-VAVE SMK-25 USB MIDI Keyboard Controller With 8 Back Drum Pads 1. Keys: 25-key force-sensitive keys 2. Drum Pads: 8 RGB backlit force-sensitive and aftertouch pads. 3. Knobs: 8 assignable 360-degree rotary knobs 4. Slider touch: capacitive touch pitch bend slider and Modulation slider 5. Output: 6.35mm sustain\expression pedal jack; USB-B type connector for wireless connection to WindowsMaciosAndroid; wireless MIDI OUT function (requires additional wireless receiver) 6. Power: 2000mAh battery-powered or USB-powered 7. Size: about 32.1 x 17.8 x 4.6cm 8. Weight: approx. 750g Features: 1. Lightweight and portable, easy to operate 2. 25 force-sensitive reed-type keys, quick rebound, comfortable feel 3. 8 RGB backlit percussion pads with force-sensitive aftertouch 4. 8 assignable encoders, customizable knobs 5. Capacitive touch bar pitch bend and modulation controls with touch-sensitive controls for easy operation 6. Combined sustain pedal port and MIDI OUT port in one unit 7. Battery-powered portable midi controller with wireless functionality, supports WindowsMaciOSAndroid multi-platforms 8. Arpeggiator, smart chord and smart scale functions