6 different sound types (Emergency, fire, ambulance, police, door chime, beep) and high volume (110 dB) Employs Z-wave Plus wireless technology, common in security and alarm systems Requires a Z-wave D-Link DCH-G020 hub for connection to the local network and the Internet, so that this device can be accessed from anywhere Integrates into the D-Link home automation system, so it can sound when a smoke detector sends a notification or when a motion detector detects an event An internet connection is necessary, both for setup and for correct operation