(a) Gun locking device means an integrated design feature or an attachable accessory that is resistant to tampering and is effective in preventing the discharge of a rifle, shotgun or firearm by a person who does not have access to the key, combination or other mechanism used to disengage the device.

(b) Magnetic key or electronic key means a magnetic or electronic device which is encoded with a unique magnetic signature or which emits a unique electronic signal that disengages a gun safety device or other safety feature of a weapon.