Optical-acoustic fire alarm panel, VAD category W. Interchangeable signaling film. Optical coverage W-4.6-9.1. Sound pressure 92dB(A) @ 1m. Surface or semi-flush mounting on box type 503. 24V DC supply voltage. Maximum consumption in 50mA signal. Protection rating IP21C. Operating temperature -10°C... +55°C. ABS casing. White color. Semi-flush mounting dimensions (L x W x D) 292 x 130 x 14mm. Approved EN 54-3 - EN 54-23. Certification: 1328-CPR-0427.