<br /> 4 frequencies for the option to provide an effective solution to the mutual interference between each set of barriers. Bi-directional transmission of a practical way to avoid mutual interference rays of the sun. AGC control circuit to ensure normal operation in very harsh environments such as wind, frost, rain, snow, fog etc.. Tip situation designed, installed more convenient and fast. Layers of technology on the subject of anti-thundering, and water proof and immunity of fixed. Qualified aluminum alloy housing, private and elegant design appearance. 360 horizontal rotation, and is convenient for installation and use. Transfer of military ranks, industrial, and a receiver that works with non-spherical lens to get a more stable and longer distance. Height of the object and the distance of the option. Intelligent pet immunity technology. It is suitable for installation on the balcony, and windows, alley, warehouse, Villa, the military and government offices, etc..