A battery powered, waterproof high intensity LED enclosed in a waterproof housing that is adapted for adhesive or magnetic attachment to a surface in the proximity of a lock. The microwave transmission unit includes a lightning conductor which is dimensioned so as to conduct lightning current without being damaged to any serious extent, and which is electrically connected to the outer conductor of the first coaxial connector and to the outer conductor of the second coaxial connector. With the interruption of the unexpected communication operation, the user’s damage, such as the payment of charges for communication services, is previously prevented. The chamber member defines a chamber room therein.