1.This system contains the advantages of all models. It adopts double side sticker. The quality is steady and credible. 2.The unique design controls the standby current at 5MA. The anti-interference is obviously much better than other products of the same kind. 3.The unique software coding technology improves the code anti-losing. 4.The product is sold to South Africa, Turkey, Southeast Asia, Middle East, Australia, New Zealand, and so on. The returning product is within 1.5-2% of the total.