Chime Pro extends Wi-Fi signal and amplifies Ring alerts. Plugs into any standard power outlet and links to all Ring devices. Chimes when connected Ring device senses motion. Features multiple alert tones, volume control, and a Do Not Disturb mode for silent option. Requires a router operating at 2.4GHz. Supports Ring Video Doorbell, Ring Video Doorbell Pro, and Ring Stick Up Cam. On-board LEDs (light emitting diodes) indicate connected, connecting, software updating, and online.