Use this SD530 Digital Portable radio in the environment with temperature between 0-40 , otherwise,it may damage your Digital portable radio. It can be operating under 2000m. Hereby,Quanzhou SFE Electronic technology Co.,Ltd. declare that the radio equipment type SD850 Digital portable radio is compliance with Directive2014/53/EU. For safe operating,the antenna for the product shall be least 25 mm away from your face and 0 mm from your body with belt clip.