A method performed by a weapon, includes interacting with a user of the weapon to receive a first code; determining whether the first code is consistent with a second code in a memory of the weapon to produce a result of determining; testing whether the weapon is in a zone; performing an operation of the weapon in accordance with the result and the weapon being in the zone. Interacting may include monitoring a switch that is operated by the user; and receiving may include determining the first code in accordance with a time between successive operations of the switch. The method may further include disabling performance of the operation in accordance with the weapon being not in the zone. And, after disabling, requiring a repeat performance of interacting and determining whether the first code is consistent with the second code before enabling performing a further operation of the weapon. An assembly for upgrading an electronic control device, the assembly includes an enclosure, an electrical connector, a battery, and a transceiver. The transceiver supplies to the electronic control device a current that conveys a result of testing whether the assembly is in a zone. A device detects that an electronic control device has been used. The device includes a radio receiver and a circuit. The electronic control device generates a radio signal when used. The circuit detects a plurality of properties of the received radio signal and outputs a signal in response to detecting.