Shenzhen Weierying Electron Co., Ltd. as a worldwide production base for security and alarm system, the products covers wireless security and alarm system, wireless/wired security and alarm system, GSM security and alarm system, alarm system with cameras, alarm system with visual door phone, personal alarm, computerize alarm center and its related accessories, such as PIR, gas leakage detector, smoke detector, vibration sensor, glass break sensor, door sensor, shutter door sensor etc ?