Comus g3sb001 grade 3 alarm extension speaker 16 ohm 92db white comus g3sb001 a 16 omega extension speaker for alarm systems a strong mylar cone enables the speaker to emit 92db 1m and there is an anti tamper switch for added security a weather resistant white polycarbonate housing allows the speaker to be mounted outside or in harsh environments comus g3sb001 16 ohm white alarm extension speaker