6 different sound (emergency, fire, ambulance, police, doorbell, beep) and high volume (110 dB) It uses wireless technology Z-Wave Plus, usual security systems and alarm Requires a hub Z- wave D-Link DCH-G020 for connection to the local network and the Internet, so that it can access this device from anywhere is integrated into the automation system of D-Link, such that may sound when a detector send a notice smoke or when a motion detector detects an event You must have internet connection, both for commissioning and for proper operation