Battery compartment adapter cap and device equipped therewith

摘要

A signalling device comprising an emission module operative on the application of battery power from a battery pack for the emission of a signal from at least one electromagnetic radiation emitting element, a battery compartment and a cap for retaining said battery pack in said battery compartment. The cap comprises at least one sensor and a switch for controlling the application of battery power. The switch is actuated when the at least one sensor detects a change in the environment in the vicinity of the device. Alternatively, the switch can be actuated remotely through a wireless interface or via a trip wire.