Yale YRM 20N Receiver Module is inserted inside the back panel of the lock to pair it with Remote Control and Video Door Phone ( VDP) . Earlier generation of the lock uses YRM 20 Receiver Module.
YRM 20 N is compatible with following Smart Door Locks: YDM 4109
YDM 3109
YDR 343
YMF 40
YDD 424
YDR 41
J 20
YDR 4110
YDM 7116 RB
YDR 50G
Works with Video Door Phone ( For Video Door Phone configuration user would need YRM 20 N and YRM 20 AMC available under Accessory Section)
Work with Yale Remote Control ( For Remote Control, user would need YRM 20 N and RC 100 available under Accessory Section)