The EZVIZ CB2 is a tiny, battery-powered smart indoor camera that comes in two distinct network versions: a standard Wi-Fi model and a separate EZVIZ CB2 4G model. Note that the 4G model uses a cellular SIM card and does not connect to Wi-Fi, while the standard model uses 2.4 GHz Wi-Fi.Core Differences: Wi-Fi vs. 4G ModelsCB2 Wi-Fi: Connects to a standard 2.4 GHz wireless network, records in 1080p resolution, and offers up to 50 days of battery life from its 2,000 mAh battery.CB2 4G: Uses a Nano SIM card with cellular data instead of Wi-Fi, upgrades to 2K resolution, and supports an optional EZVIZ Power Partner for extended setups.