SMK-25mini MIDI Keyboard Rechargeable 25-Key MIDI Control Keyboard Mini Portable USB Keyboard MIDI Controller with 25 Keys Features: Battery supplied portable MIDI controller with wireless function. Multiple device connections: wired, wireless, wireless direct, wireless adapter connection, MIDI OUT connection. USB-C port for connection and charging. Two power supply methods: USB power supply, battery power supply(built-in 780mah lithium battery). 25 velocity sensitive piano keys, 1 distributable 360 degree rotary knob. Powerful, with arpeggios, intelligent scales, chords, and other functions. 3.5mm continuous tone/expression pedal interface. Sustain pedal port and MIDI out port all in one. One button to control Sustain, Modulation and Pitch up/down functions. Smart Chord and Scale feature make you get inspiration easily. Compatible with Wins/MAC/IOS/Android and other systems. Compatible with all digital audio workstation. Specifications: Material: ABS Keys: Twenty-five velocity-sensitive keys Knobs: 1 assignable endless 360 degree encoders Output: 3.5 Sustain pedal connection port; USB-C port; Wireless connection with Wins/Mac/iOS/Android; Wireless Midi Out Function (Need extra wireless midi device) Power: 780mAh battery supplied or USB-bus-powered Item Size: 348 * 105 * 38mm / 13.71 * 4.13 * 1.50in Item Weight: 450g / 15.88oz Package Weight: 614g / 21.68oz Package Size: 38.5 * 14 * 6.7cm / 15.16 * 5.51 * 2.64in Package List: 1 * MIDI Keyboard 1 * Type-C Cable 1 * Manual (English)