The Blink Video Doorbell (2nd Generation) is also shorter but slightly wider than the original, too. Powered by batteries, the Blink Video Doorbell (2nd Generation) comes with three AA lithium batteries and a Blink Sync Module Core which extends its battery life for up to two years.
BATTERY POWERED: Powered by the built-in rechargeable battery or connect it to your existing doorbell wires for constant power. EASY INSTALLATION: Connect your battery-powered Video Doorbell (2nd Gen) to wifi in the Ring app and mount it to the wall using the included tools.

The Ring Battery Doorbell (2nd Gen) Ring. As for those other two cameras, Amazon says the Battery Doorbell will feature up to 6x Enhanced Zoom in a streamlined, rechargeable design, while the Plus model gets a Quick Release Battery Pack that you can pop out to recharge.

This particular example perfectly highlights why Battery Doorbell 2Nd Gen is so captivating.
The Blink Video Doorbell (2nd gen) is a well-designed, no-frills device that offers head-to-toe video and exceptionally long battery life for less than $100.

Yes, battery-operated Ring video doorbells can be hardwired to an existing doorbell system or transformer for continuous charging (8-24 VAC, 40VA max, 50/60Hz), or by using a Ring Plug-in Adapter (2nd Gen).
The Google Nest Doorbell (Battery, 2nd Gen) features 960 x 1280 resolution, a 145-degree field of view, and the option of wired or battery connectivity.