ATEX Sounder designed for installation in environments with a high risk of explosion. To be connected to Zener barrier item 48BAZ001, maximum 2 sirens per line, with synchronised sound. It has 49 different tones programmable via DIP-Switches and second and third tone option for different alarm stages. Operating voltage 16-28V CC. Maximum power consumption 25 mA. IP65 Protection rating. ATEX II 1G Ex ia IIC T4 Ga approved and certified. Certified to EN54-3.