A blinking green LED on Blink cameras signifies the device has gone offline and is trying to reconnect to your Wi‑Fi network.

If you’re using Blink home security cameras—particularly the Blink Outdoor 4—you need this gadget on your network.

If that's out, the next step is fully resetting both your camera and your Sync Module. Both devices have a reset button either on the back or under the battery cover.