Skylink BA-100 Back-Up Battery with LED Feature for Skylink Garage Door Openers Reliable battery power - delivers sufficient power to the Openers when a power failure occurs, ensure the convenient access to the garage door at any time Simple installation and no additional outlet is needed, compatible with all Skylink atoms garage door Openers Designed with discharge, overcharge and overload protections on battery which brings maintenance free and long battery life cycle Built in LED light will provide Lighting during power outage. Blinking LED with different colors indicate the battery status The BA-100 is also compatible with Skylink eq-1511/eq-1522 garage door Openers (requires AC adapter, not included)