Chamberlain garage door opener 2 channel transmitter , Two large rectangular off white colour buttons first button has ridges throught, second button smooth finish to set for private door opener Controll-A-Door 4. CAD4 27.145MHZ . This motor has more than 1 meter long antenna .
This remote has been discontinued and upgraded to a conversion kit which is MK602 , with one receiver and two remotes.
The installation can not be easier.
Instruction will be sent with the products.
This one is upgraded to MK602.