PMR446 (personal mobile radio, 446 MHz) is a part of the UHF radio frequency range that is open without licensing for business and personal use in most countries of the European Union. (It has roughly the same use as FRS or GMRS in the United States and Canada.) Depending on surrounding terrain range can vary from a few hundred metres (in a city) to a few kilometres (flat countryside) to many kilometres from high ground. It is ideal for line of sight outdoor activities. PMR446 is used in both professional and consumer-grade walkie-talkies (similar to those used forFRS/GMRS in the United States and Canada).