The HEIMAN Zigbee Smoke Sensor uses an advanced smoke detection system to alert you acoustically (85 dB) and visually (red LED). It connects to Zigbee 3.0 gateways for smartphone notifications when you're away, helping prevent fires and costly damages. Features: compliance with DIN EN14604, low battery indication, 3-year battery life (1x CR123A), and Zigbee 3.0 wireless technology.