According to the information gathered, both doors have virtually the same/similar technical specifications in terms of video audio, video and connectiviry
Video 5 megapixel progressive CMOS 5MP(2560 x 1920) Night vision: 5m(16.5ft) distance 2.0mm fixed lens Field of view: 164°
Audio Video compression: H.265 Audio compression: AAC Up to 15fps frame rate Bidirectional two-way conversation Echo Suppression
Connectivity Wi-Fi: IEEE802.11b/g/n,2.4GHz & 5GHz Imou life App: iOS, Android
The difference lies in the power options, as the DB60 model has a built-in rechargeable battery that can power the doorbell for up to 6 months, allowing installation in places where wiring is not possible, while the DB61i requires a wired connection to the power adapter or doorbell installation.