Features:  Simple and easy to operate, achieve multiple modes of  transformation easily.  Handhold instrument design, built-in high-performance batteries for easy to carry around with you.  GM counter tube compensated, improved energy response.  High detection sensitivity, especially for environmental radioactivity  monitoring to detect traces of nuclear radiation.  Use built-in probe type, the effective protections of the probe is not damaged.  Retain count sound, you can quickly determine the radiation situation surrounding environment, to quickly locate the exact location of radiation sources.  Anti-interference ability, capable of reliable operation in complex  electromagnetic environments.  Instrument display accuracy up 0.001μSv/h(CPM mode is up to 1CPM).  Widely used, can be used in the home environment, daily necessities, mineral rocks, decorated stone and other radioactive detection.  Note: 1 min automatic shut off LCD backlight LED light, press either button to restore LED backlight.   Specifications:  Name: Geiger Counter  Detect ray: γ, β, X ray  Waterproof: no  Power: 1W  Operating temperature: -5℃ to 40℃  Input: D-C 5V, 0.5A  Operating voltage: D-C 3.7V  Battery: 1 * 14500 lithium battery, 3.7V, 1600mAh (included)  Item size: 137 * 71 * 27mm / 5.39 * 2.80 * 1.06in  Item weight: 160g / 5.64ounce  Package size: 150 * 150 * 52mm / 5.91 * 5.91 * 2.05in  Package weight: 330g / 11.64ounce   Package list:  1 * GMV2 Geiger Counter  1 * Power Cable