... , school, shop, moving cars, trains or take care of elders and children as long as WCDMA network is available. Modern ... in case of external power failure Application: taking care of the elders and children, in house, school, monitoring shop, bus, ship, ... with battery):115g4.Applications1) CCTV surveillance system upgrade: On the basis of the original CCTV monitoring / alarm system, you only need to ...