Quick-Release Battery Pack allows you to have backup power for select battery powered Ring Doorbells and Cameras. To charge your battery pack, simply connect it to a micro-USB cord and plug it into a power outlet. If the battery pack in compatible Ring Video Doorbell or Security Cam runs out of power, you can remove your batteries by pressing the quick-release tab on the battery pack. Fits Video Doorbell 2, Video Doorbell 3, Video Doorbell 3+, Spotlight Cam Battery, Spotlight Cam Solar, Stick Up Cam Solar (all generations), Stick Up Cam Battery (all generations), Solar Floodlight and Peephole Cam.