a. The official standard is rechargeable batteries, there is no need to replace.
b. If necessary, you can use the standard screwdriver to screw out two black screws on the back cover of the camera, remove the cover and replace the battery.
2.Why the App Will Not Take Effect until the Next Trigger?
In order to increase the working time of camera, the camera did sleep processing. After set up, the app will take effect synchronously when the camera is connected to the server next time.