539-4552, Klaxon, Klaxon Nexus 105 Series Surface Mount Electronic Sounder, 10 → 60 V dc, 105dB at 1 m, IP66, DC, 64-Tone Klaxon Nexus 105 Series Surface Mount Electronic Sounder, 10 → 60 V dc, 105dB at 1 m, IP66, DC, 64-Tone