About This CONVENIENCE - This Wasserstein Blink Video Doorbell chime provides an audible tone for your Blink Video Doorbell, so you can know who is at the door without constantly monitoring your smartphone SEAMLESS PAIRING - Wired is needed to link the transmitter and your doorbell. Use the pre-installed cable first; pair the transmitter and receiver by holding the brightness buttons for 3 sec, then ring the doorbell button on Blink Video Doorbell CUSTOMIZATION - This Wasserstein chime for Blink doorbell is equipped with 7 tones and 4 LED color options to give you greater customization with your doorbell MULTIPLE CONNECTIONS - Optimize for larger living spaces by adding up to 5 receivers on one transmitter with your Blink doorbell for home. Please insert AAA batteries in the transmitter. The transmitter and receiver are pre-paired. BLINK DOORBELL COMPATIBLE - This Wasserstein doorbell chime is fully compatible with the Blink Video Doorbell