Red & Green. This polycarbonate call point cover from Asec is supplied with a choice of red or green housing shell & a glow in the dark frame, as well as an integral sounder. It is suitable for either flush or surface mounting and is ideal for retrofitting over an existing break glass call point. When the cover is lifted to gain access to the break glass call point, the battery powered sounder emits a 96db alarm to help dissuade pranksters & vandals.. Supplied with 96 dB sounder. Robust tamper proof polycarbonate cover. Supplied with choice of red & green inserts & 1 break seal. Glows in the dark