While assisting officers from another jurisdiction who were dispatched to a report of three armed males using narcotics, a fellow officer was standing in the rear of the residences near the rear door. The very first thing I noticed was that the blue L.E.D. in his “Bluetooth” headset/earpiece was flashing. The light was bright and easily seen, particularly in the diminishing daylight. It not only exposed his position but also provided an excellent target for the bad guys if they were to decide to start firing at us. If you wear a device like this that is lit, remove it, or find a meands for covering the light, before entering a situation like this.t