... 15 wireless alarm sensor at the same time. widely used in nuring children and the old, preventing burgling family, shops ... anywhere.13 Application: taking care of the elders and children, in house, school, monitoring shop, bus,ship, and train etc.14. ... Shooting angel 60 degree(horizontally),60degree(vertically)Best shooting distance in night ≤6 meterLithium battery 800mAhBattery standby time 24 hours( ...