Defender is an innovative indoor fire hydrant equipped with multifunctional firefighting modes and a cloud-based system. It utilizes various firefighting modes, and firefighters can remotely connect for on-site exploration to prevent fire spread and enhance firefighting efficiency. Defender locates and deploys its water mist wall at the fire's onset. Citizens can use its extinguisher for small fires. Firefighters access internal fire scene data remotely and control the vehicle. When arrival, they can retrieve the fire shield to aid in tackling the blaze for firefighting