For over 15 years, we have earned the confidence of our valued customers in providing security technology equipment & service in the USA. HEIVISION and It's parent company: Best Surveillance System as well as its predecessor: Sitailong International Inc has been involved in the research and develpment of digital video technology since 1990's, the digital video surveillance systems developed & integrated by HEIVISON have been widely applied in banks, school, supermarket, office building, residential building etc. The most prominent clients include Asian Bank, First Central Savings Bank, Chinatrust Bank USA, Staten Island College, McDonalds, Burger King, Dunkin Donuts, Subway etc.