Magnetic Autocontrol 28' White Octagonal MicroBoom XL Arm Only | MAG-MICROBOOM_XLC028 1500 lbs The LiftMaster LM21XP Release Device

The LiftMaster LM21XP Release Device is a UL/ULC listed normally energized fail-safe device designed for use on rolling doors

Installer / User App

This is a replacement Power Supply Kit

NEMA 4X rated for superior weather resistance

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Magnetic Autocontrol 28' White Octagonal MicroBoom XL Arm Only | MAG-MICROBOOM_XLC028 1500 lbs The LiftMaster LM21XP Release DeviceMagnetic Autocontrol 28' White Octagonal MicroBoom XL Arm Only MAG MICROBOOM_XLC028 The Magnetic Autocontrol White Octagonal MicroBoom XL Arm is a 28 foot extended length barrier arm engineered for Magnetic Autocontrol Access XL2 and MicroDrive XL barrier systems. Designed for wide lane vehicle access, this heavy duty Microboom combines strength, visibility, and reliability for large scale applications. Constructed from durable, lightweight material