Lap dat camera voi muc dich quan sat, giam sat khu nha o, van phong lam viec hay cac shop, cua hang, hieu thuoc… khong con qua xa xi voi nguoi dan Viet, dac biet la tai cac thanh pho nhu Bac Ninh, Ha Noi...Tuy nhien de chon loai camera gia re chat lu...