Security features help prevent radio theft.
Detachable Face let's you remove the receiver's face and take it with you (the receiver will not operate without its face).
Key Card security requires that a specific card be inserted in the receiver for it to operate.
A Camouflage Face rotates or retracts into the receiver, leaving a blank panel that looks like the face has been removed. Some camouflage faces are also detachable.
Removable models let you take the receiver with you.