Handheld volatile organic compound (VOC) detector. Photoionization sensor with standard 10.6 eV or optional 9.8 eV or 11.7 eV lamps. Battery: rechargeable, external field-replaceable Lithium-Ion battery pack and alkaline battery adapter. Size: 10 x 3 x 2.5 inches. Weight: 26 oz. 16 hours of continuous operation. Displays: 4 lines, 28 x 43 mm, with LED backlight for enhanced display readability. Keypads: 1 operation and 2 programming keys, 1 flashlight on/off. IP67 Waterproof design for easy cleaning and decontamination in water.