Never Miss a Visitor: Hear the chime throughout your home. Receive real-time notifications when someone rings the doorbell, or if motion is detected at your door. Custom Tones: Select from 8 chime options and set the ideal volume for your home. Store Doorbell Footage with a microSD card: Add up to 128 GB for storing footage from your doorbell camera by adding a microSD card (not included). Video is protected even if your video doorbell is damaged or lost. Easy to Set Up: Simply plug in, connect to your 2.4 GHz Wi-Fi network, then with just a few taps in the app you're up and running in no time. Official Accessory: Works with Video Doorbell E340, C31, C30 and all upcoming eufy video doorbells. However, it does not support other eufy Security doorbells at this time