Linear eMerge Elite 4-Door Expansion Node EXN-4CB/4C access control system If you want to use

If you want to use your own HDD

The LiftMaster MH is ideal for small rolling steel doors/grilles and high or vertical-lift sectional overhead doors in medium-duty-cycle commercial applications where a manual hoist is required

LiftMaster Q523

LiftMaster K20-1100C-2

Linear eMerge Elite 4-Door Expansion Node EXN-4CB/4C access control system If you want to useLinear eMerge Elite 4 Door Expansion Node EXN 4CB 4C eMerge Elite Expansion Node with 2 Reader ports, 4 Inputs, 4 Output relays, and optional POE, housed in a compact plastic enclosure with integrated tamper switch. eMerge Elite Expansion Node with 4 Reader ports, 8 Inputs, 8 Output relays, and optional POE, housed in a compact plastic enclosure with integrated tamper switch.