More security in the house with the br 1211 smoke detector the photoelectric smoke detector is tested according to en 14604 and has a built in transmitter and receiver wireless networking of the smoke detector can be done with a total of 12 smoke detectors and 16 wireless channels are available if an alarm has been triggered you can quickly locate the triggered smoke detectors as they can be identified both visually and acoustically the shrill tone 85db can also be muted low battery leve