Milesight - 1 * 4000mAh ER18505 Li-SOCl2 Batteries Battery Life: Up to 5 Years (30 min Interval + 64 Triggers per Day, 25°C) Equipped with Passive Infrared and Fresnel Lens for Motion or Occupancy Detection Provide Different Types of PIR Covers for Adjustable and Flexible Field Angles and Different Detecting Ranges Advanced Features: Data Storage / Data Retransmission / Milesight D2D Controller NFC Enabled IP30 Rated