This product was imported personally from Positive Grid. This is the first time it has been opened since purchase. The protective nylon bag has not been opened. It can be used with CoreMIDI compatible devices. This is a foot controller for connecting to iOS devices via Bluetooth and controlling apps with MIDI. Compatible apps are not limited to those made by Positive Grid; it can also be used with other companies' apps such as GarageBand if they support CoreMIDI. It has an expression terminal, allowing you to connect commercially available pedals to control volume, wah, etc. in real-time. The function assigned to each switch is set in the dedicated app, BT Bluetooth MIDI Pedal Editor. Connection: Bluetooth 4.0 Switches: DPDT switch x 4 Guitar Input: 1/4" phone x 1 Output: L: Mono 1/4" phone x 1 Headphone Output: R: Stereo 1/8" phone x 1 iOS Audio Connection: 1/8" phone x 1 Power: AA batteries x 2 Size: 280 mm x 100 mm x 37 mm MIDI Messages: Control Change Program Change Bank Change The BT series Bluetooth MIDI Foot Controller BT-2/BT-4 wirelessly controls MIDI-compatible apps hands-free. Musicians gain the freedom to focus on their performance. The BT2/BT-4 is a MIDI foot controller that allows users to fully program the MIDI messages controlled by the foot switches in the iOS app. It also supports expression pedals, allowing real-time control of effects such as volume and wah. No cables are needed as it connects to iOS devices and Macs via Bluetooth. Everything from switching stomp boxes to volume control and page turning in score apps can be foot-controlled.