MIDI controller with multi-function buttons and 8 sliders and knobs. Used item. Body only. The exterior is still in good condition. I checked the power, buttons, and knobs. All have signals, and all the LEDs light up. I don't know how to use it, so I don't know how it functions. - Model Name: APC40 - Brand Name: AKAI - Compatibility: Ableton Live - Function: MIDI Controller - Number of Buttons: Multi-function buttons - Number of Sliders: 8 sliders - Number of Knobs: 8 knobs Thank you for viewing.