- See who's at your front door in clear Full HD with this Eufy C31 doorbell- Chat to your visitor in real-time with two-way audio or send a quick response if you're busy- The quick-release battery makes it easy to recharge - or you can hardwire for 24/7 recording- This doorbell is compatible with eufy's HomeBase 3 and Minibase Chime for extra functionality- You can store footage on the included microSD card or back-up to the cloud (subscription required)