A combination non-programmable and programmable key for a security device of the type used to display items of merchandise includes a non-programmable portion for cooperating with a mechanical lock of the security device and a programmable portion for cooperating with a sensor of the security device that is operatively coupled to an alarm for indicating a security threat to the security device or to an item of merchandise displayed on the security device. The non-programmable portion includes a side assembly having a magnet that cooperates with a magnetically attractable locking pin to unlock the mechanical lock of the security device. The programmable portion emits an energy signal that cooperates with the sensor of the security device to disarm the alarm and thereby permit the security device to be removed or an item of merchandise to be removed without the alarm indicating a security threat.