The 12th China Public Security Expo was held in Shenzhen on 1st Nov 2009. Longhorn, as the brand of intrusion alarm, ,shew the products together with CSST group.The 12th China Public Security Expo was held in Shenzhen on 1st Nov 2009. Longhorn, as the brand of intrusion alarm, ,shew the products together with CSST group.The 12th China Public Security Expo was held in Shenzhen on 1st Nov 2009. Longhorn, as the brand of intrusion alarm, ,shew the products together with CSST group.The 12th China Public Security Expo was held in Shenzhen on 1st Nov 2009. Longhorn, as the brand of intrusion alarm, ,shew the products together with CSST group.The 12th China Public Security Expo was held in Shenzhen on 1st Nov 2009. Longhorn, as the brand of intrusion alarm, ,shew the products together with CSST group.The 12th China Public Security Expo was held in Shenzhen on 1st Nov 2009. Longhorn, as the brand of intrusion alarm, ,shew the products together with CSST group.The 12th China Public Security Expo was held in Shenzhen on 1st Nov 2009. Longhorn, as the brand of intrusion alarm, ,shew the products together with CSST group.The 12th China Public Security Expo was held in Shenzhen on 1st Nov 2009. Longhorn, as the brand of intrusion alarm, ,shew the products together with CSST group.The 12th China Public Security Expo was held in Shenzhen on 1st Nov 2009. Longhorn, as the brand of intrusion alarm, ,shew the products together with CSST group.