SPW-220 O is a siren with optical and acoustic signaling, designed for indoor installation and provided with super-bright LEDs and piezoelectric transducer. The two optical sets placed on the sides of the enclosure make the light alarm of the device perfectly visible even from a large distance, also in daylight. It offers three types of 120 dB intensity modulated tones to choose from. The loud signal ensures good audibility over a large area, e.g. in warehouses, production halls, parking lots inside buildings, etc. Enclosure of the siren is made of polycarbonate, thus ensuring high mechanical strength and aesthetic appearance of the device that remains unchanged over time. The siren is provided with tamper protection against opening or tearing off the wall.