Indoor siren with 868 MHz Tri-X bidirectional wireless technology. No light, high frequencies for reliable transmission. RF range: 1600 m (open space). Sound power: 90 to 110 dB. Configurable power on / disarm sound and LED indicator. 3 types of alarm sounds: fire alarm, panic alarm and intrusion alarm. Fully configurable through APP. Protection against sabotage. Batteries: 3 * CR123A (included, easily replaceable). Battery life: 3 years (activated once every two weeks and 90s alert for each activation).