Where can I learn surveillance installation in Xi’an?

If you want to intervene or learn, I think you might as well find a joint defense company in Xi'an because they install more monitoring systems so that you can learn faster and they will teach you everything without reservation. You can save them a lot of things by teaching them. Furthermore, you can go to someone who sells surveillance cameras for consultation, because they sell surveillance cameras, some sell surveillance cameras, and they also install surveillance cameras. Remember, if you are looking for someone who sells surveillance cameras, be sure to find one with fewer apprentices, because that way Only a boss can teach you real skills. If what I provide is valuable, please accept it after reading it. Thank you