SMK-V and SMK-H have built-in 12V relay contacts which can be connected directly to either an electric strike or magnetic door lock. For the highest level of security and programming flexibility, SMK-V and SMK-H also have a built-in Wiegand-Out port which can be connected to most any access control panel (including ZKAccess C3 and InBio door controllers). SMK-V and SMK-H come standard with a built-in ZKAccess 125 KHz 26-bit RFID card reader.