The Hexpander MIDI interface is for Guitar or Bass and includes:
PD-0440-00 Hexpander MIDI interface
PD-0540-00 13-pin Output Jack
PD-0515-00 13-pin Mounting Plate
PD-0512-00 Interface Wiring Harness
PD-0511-00 Extension Wiring Harness
The Hexpander does not require a battery because it draws power from the MIDI converter through the 13-pin connector.