Combining audible alarm sounder with 5 Joule flashing Xenon strobe light, PATROL Model PA X 1-05 can serve as hazardous gas warning alarm when connected to remote alarm relay of toxic/combustible gas detector controller. Nominal 100 dB sounder offers 80 different alarm tones and maximum output of 105 dB, permitting use as notification appliance for evacuation purposes in noisy, industrial environments. Light can be operated simultaneously with sounder or controlled separately.