Combines a PID with the standard four gases of a confined space monitor (O2, LEL and two toxic gas sensors). Battery: interchangeable Li-ion and alkaline battery packs. 14 hours continuous operation with Li-ion. Displays: 2 line, 16 digit LCD with LED backlighting automatically in dim light or alarm condition. Keypads: 1 operation and 2 programming keys. IP55. Temperature: -4° ~ 113 °F (-20 ~ 45°C). Size: 4.65 x 3 x 1.9 inches. Weight: 16 oz. with battery.