otes1：This model can only cloning 433mhz switch remote controls, it is not compatible with rolling code or billion code. Please find out the operating frequency of your old/original fob before purchasing to avoid disappointment Note2：The gate remote have a chip type demand,only works with the compatible chip,showing on the listing description,please check if your original remote chip type to see if be in the compatible range before purchasing 3.The ABCD four buttons could respectively copy four different types of chips, that is a remote control can operate four different types of facilities. 4.Only works for 433MHz,transmit distance is 50-100m(Open space) ,bringing you new experience of remote control and much convenience in your daily life. 5..High accuracy of copying and high effective of copying,duplicate your existing remote control in case you lost it.