Milesight - 2 * 9000mAh ER26500 Li-SOCL2 Batteries Battery Life: Over 10 Years (10 min Interval, 25°C) Selective Probes Vary from 25 to 1000 cm for Multiple Applications Equipped with NTC Temperature Sensor for the Detection and Alarm of Burning NFC Enabled Resolution: 1 mm Material: PC + ABS Flame Retardant Grade: V0