Hardwire compatible Ring Video Doorbells to your mains circuit using existing doorbell wiring, for non-stop power and protection with this Ring DIN Rail Video Doorbell Pro Adapter It is compatible with Video Doorbell Wired, Video Doorbell Pro and Video Doorbell Pro 2 Setup Requirement: Requires 18mm or 36mm module space in suitable DIN Rail enclosure. For Compatible Ring Doorbells - see ring.com/hardwired for details. Operating Conditions: -25°C to 55°C , DIN Rail Transformer must be installed in a suitable enclosure and in a controlled indoor environment. Power Input: 100-240VAC~0.3A, 50/60Hz, Power Output: 24VDC, 0.42A, 10.0W Built-in short-circuit protection. Note: Not compatible with mechanical or digital chimes.