CLICK TO LOCK: The automatic locking design prevents end separation for an uninterrupted power supply. Locking and unlocking is easy, simply insert the male end into the locking connector, push it together to lock and pull the collar down to unlock. LIGHT THE WAY: Get CGM status at a glance with the lighted visual power aid. An amber LED male plug indicates power from the outlet and through the extension cord while a green lit LED on the female end indicates ground continuity in the cord and circuit.