Features - Can be triggered by BrilliantSmart reed switch; PIR sensor or camera. - Loud sound when activated. - Brilliant Smart app notification to phone or tablet when siren is triggered. App sounds alarm. - Battery or USB operated; no hub required: CR123A-3V x 2 (not included). - 1m USB power cable.ED indicator. - Sound level: up to 90dB. - Sound selection: up to 10 types. - Control from anywhere via BrilliantSmart app. - Connects to other BrilliantSmart devices - reed switch; sensor; camera or light via the app.