Amazon.com: eufy Backup Battery for HomeBase 2, Continuous Power Supply in Power Outages and Emergencies, Backup Battery for eufy Security System, Compatible with eufy Homebase 2, Extra Battery and Protection : Electronics
eufy Security eufyCam 2
eufy Security Video Doorbell Chime, Add-on Chime, Requires eufy Security Video Doorbell 2K (Battery Powered), Simultaneous Ringtone, Adjustable Volume, Only Works with HomeBase 2 - Walmart.com