It is double-end wired on line voltage (ballast bypass).
Should any malfunction be detected during self-testing, such as insufficient battery capacity, the warning indicator on the lamp will flash and alert the team. This saves a facility management team a tremendous amount of labor from manually testing every single lamp of this kind in its facilities. G3 Plus Emergency LED T8, Automatic Self-testing, 8W, 4000K, 2ft, 25PK More importantly, the lamp will automatically self-test for 30 seconds monthly and for 90 minutes annually, thus meeting the emergency lighting audit requirements with no labor cost..