This remote suits for EASYLIFTER opener EL4. Model No. 50739 420EBD is the same. same frequency same size and same function.
It can be converted to key ring size. MK601 is with one remote, MK602 comes two key ring remotes.
This remote has been discontinued and replaced by upgrade kit MK602 .
This one is upgraded to MK602.
It's also avaible MK601.