CONVENIENCE - This Wasserstein Blink video doorbell provides audible tone for your Blink video doorbell, so you can know who's at the door without constantly monitoring your smartphone SEAMLESS PAIRING - Cable is needed to connect transmitter and doorbell. Use the pre-installed cable first; pair the transmitter and receiver by holding the brightness buttons for 3 seconds, then tap the doorbell button on the blinking video doorbell CUSTOMIZATION - This Wasserstein doorbell 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. Insert AAA batteries into the transmitter. Transmitter and receiver are pre-paired. Blink Doorbell Compatible - This Wasserstein doorbell is fully compatible with Blink Video Doorbell