Features For radiation hazard radius of loop undesirable three plug electrical in the electricity use. For radiation hazard radius of all the two plug electrical in the electricity use. For radiation hazard radius of high voltage transmission line tower. For radiation hazard radius of using GSM mobile phone dialing. Abnormal fluctuations of electromagnetic radiation in other environments. Specification:  Condition: 100% Brand New Item Type: Radiation Detector Material: ABS Size: Approx. 145 x 20 x 20mm / 5.7 x 0.8 x 0.8in Power Supply: 1.5V(AAA)x 2 (Not included) Detect Range: ≥ 50uw/cm² Package List:  1 x Radiation Detector Pen 1 x Instruction Note: 1.To replace the battery in time, so as not to cause the battery aging and liquid leakage, if not, the circuit board will be damaged. 2. When the voice alarm call before a weakened obviously, please pull out red back cover and replace the battery. 3. When detected excessive electromagnetic radiation, monitoring pen immediately issued a red flashing light, and the voice alarms continuously, until your environment achieves safe recovery static state detection.   Package List