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Communication Protocol Freewave2™ two-way ISM GFSK with 5 frequencies & LBT Operating Frequencies 868MHz or 916MHz Identification Unique ID serial number – 24 bit Events Transmission Alarm, Tamper, Supervision, Low Bat. Supervision Time 7 min by default Transmission Range 500m open space Alert Method Internal Piezo and LED Sound Level 85dB at 1 meter Flash Light White LED Battery 2 x Lithium battery 1.5V AA Energizer L91 Battery Life Up to 5 years Current Consumption Average Current : ~60uA Max Current: Alarm 750mA Tamper Switch Bracket Removal Operating Temperature -10°C to +55°C Dimensions / Weight 93 mm x 93mm x 26mm / 80gr. Compliance EN50131 Security Grade 2 Class II