Can indoor bullet cameras be installed outdoors?

No.

Indoor cameras have poor waterproof performance and low waterproof level. If it encounters rainy days when installed outdoors, it is very likely that water will enter the equipment, thus damaging the surveillance camera.

Except for waterproof performance, indoor and outdoor cameras have most of the same functions, so outdoor cameras can be used indoors because there is no need to worry about waterproofing. Indoor cameras cannot be installed outdoors. Therefore, it is better not to install indoor cameras outdoors for the life of the camera.