Licence-free walkie talkies PMR 446, 0.5w output power, fixed antenna these technical parameters make Retevis RT24 walkie talkie a completely legal radio in UK and Europe. What is PMR446? 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 Europe area. Retevis RT24 walkie talkies is such a professional radio, which you can rest assured to use and no need to worry about the license problem. Long Range and Long Standby The range reaches about 1 to 2 km in the city depending on the working environments and 2-3 km in open field; In standby mode, the battery can last about 40 hours and in normal use, the battery can last 8-12 hours, enough for indoor and outdoor activities.