Blink cameras can't operate offline and require a 2.4 GHz Wi-Fi Internet connection. One important reason is because cameras use Wi-Fi to send images and notifications. Blink systems minimally require a high speed connection of at least 2 Mbps upload speed.
Wi-Fi is also important for Blink cameras that need to connect to a Sync Module on the same Wi-Fi network. The Sync Module is the brain of the system and conveys commands between the Blink application, Blink Servers and your camera. Without an internet connection this data exchange is not possible. Mini cameras; however, do not depend on Sync Modules and only require a local Wi-Fi signal in order to function.