LiftMaster LM21XP Extended Performance Release Device SEA solar kit full-duplex telephone communications between visitors

full-duplex telephone communications between visitors and residents for granting access

card + pin

Usage Classification: Class I

Battery Backup for THALIA Control Boards P125020

Memory Type: EEPROM

LiftMaster LM21XP Extended Performance Release Device SEA solar kit full-duplex telephone communications between visitorsLiftMaster LM21XP Extended Performance Release Device The LiftMaster LM21XP Release Device is a UL ULC listed normally energized fail safe device designed for use on rolling doors, single slide, center parting level, and inclined track doors. This device is a normally energized fail safe releasing device incorporating state of the art electronic control circuitry. The release device responds to emergency conditions generated from an automatic