Capture Devices is a devices used to capture Mio-la-mon. You can capture Mio-la-mon in Dungeons, Caves and Tunnels.
Capture Devices with a "RED M" indicates the Mio-la-mon has NO Stamina!
Gray Capture Devices indicates you don't have any Mio-la-mon Summoned!
Capture Devices with a "Yellow M" indicates the Mio-la-mon has stamina!
Neuclear Capture Devices indicates your Ultra Ability is active for your Mio-la-mon!