PL 70 EN is a ceiling speaker featuring a flameproof steel bottom designed for recess installation in false ceilings or panels. It is especially suitable for broadcasting alarm messages thanks to highly intelligible sound reproduction and is resistant to the high temperatures reached during fires. The terminal connection boards are in ceramic material for input and output flameproof cables. Thermal fuse, protects integrity of the line in case of heat affecting the speaker. Ground screw. Cables inside speaker made using flameproof leads.