Outdoor wireless sounder. 868 MHz Frequency (Compatible with SPECTRA PLUS serie and MG6250). Includes transceiver. 100 dB output. Alarm response time: 4 seconds. Maximum alarm time: 8 hours. Mutual sounder supervision. Triple tamper protection (Screw, cover and wall). Battery power supply (Even if it´s not necessary the sounder can also be power supplied by an external battery 8-16V CA / 9-20V CC). Operating temperature from -15°C to +50°C. Airtight housing made in PC/ABS with UV rays protection and plate protected with silicone. Dimensions: 240 x 60 x 180 mm. Security grade 2 certified according to EN 50131. Not compatible with SP4000.