2. Canadian Maple Leaf (paradox, I worked in it, the company's products are first-class in quality, and the service is also first-class, all-weather service);
3.Tyco (one of the largest electronic security and alarm monitoring service providers in the world, a diversified multinational enterprise, and an anti-theft alarm brand);
4. Bosch Security (a leader in the security/communication industry, one of the top ten anti-theft alarm brands in China, a Fortune 500 company and a global comprehensive multinational group);
5. Dashi Intelligent (leading service provider of building intelligent energy saving, national high-tech enterprise, backbone enterprise of software industry base, top ten brands of anti-theft alarm);
6. Champda (a national high-tech enterprise, a famous trademark in Guangdong Province, one of the top ten brands of burglar alarm, participating in the formulation of many national standards);