48 chip used on most model
T5 chip inside
4D0 837 231 R ,433MHz2button
4D0 837 231 N,433Mhz
3button
4D0 837 231 M .315Mhz
3button with Panic button
4D0 837 231 P,315Mhz ,
3 button Remote Case without Panic buttonuse 2032 Battery
3 Button Remote Case(without Panic button)use 2pcs 1616 Battery