My company are a Electronic company in china and most produce Video entry system and Audio entry system! Depends on the strong technology strength, our company independently developed several series of video and audio door entry system for villa kit and apartment buildings. There are totally more than 100 models available to meet various requirements and preference of all kinds of customers. Our company has attained ISO9001: 2000 authentication ,and some of the products have attained CE ,CCC and UL certification!