ShenZhen Big screen computer co., ltd. was established in 2010, and is a professional manufacturer of security systems.Main products line as below, 1. GSM alarm systems, MMS camera alarm systems and auto-dial alarm systems used for house, supermarket, factory, office and school. 2. CCTV camera systems and DVR for surveillance. 3. Intercom systems for home, factory, office, parking lot, etc. "Offer good quality security systems with lowest price" is our belief for long-term development. All of Golden Security alarm systems are designed and developed entirely in house with leading technologies, backed by more than 30 seasoned R&D engineers. We provides security alarm solutions for every distributor to develop and grow their local market share. ShenZhen Big screen computer co. gains respect and popularity globally. Now, we are looking for distributors and agents worldwide