Features: Security burglar fire beautiful 1, [Security] - to ensure that the elderly, children activities in the balcony window, security, prevention of falling objects and prevent clothes from falling. 2, [beautiful] - each a diameter of 1.8mm, not hinder ,10-15 meters from the line of sight can be basically invisible, does not affect the architectural style. 3, [fire] - ability to design high-strain, the case of an emergency such as fire escape 3-5 seconds. 4, [security] - prevent network connections at both ends of the alarm device, disconnect the alarm in any immediate alarm.