Multiple countries have created similar radio services, with varying technical standards and requirements for licensing. CB radios have a range of about 3 miles (4.8 km) to 20 miles (32 km) depending on terrain, for line of sight communication however, various radio propagation conditions may intermittently allow communication over much greater distances. Transmitter power is limited to 4 watts in the US and the EU. Users on a channel must take turns talking. The radio is normally in receive mode to receive transmissions of other radios on the channel when users want to talk they press a " push to talk" button on their radio, which turns on their transmitter. Like many other land mobile radio services, multiple radios in a local area share a single frequency channel, but only one can transmit at a time. In many countries, CB operation does not require a license, and (unlike amateur radio) it may be used for business or personal communications. Citizens band is distinct from other personal radio service allocations such as FRS, GMRS, MURS, UHF CB and the Amateur Radio Service ( "ham" radio). Citizens band radio (also known as CB radio), used in many countries, is a land mobile radio system, a system allowing short-distance one-to-many bidirectional voice communication among individuals, using two-way radios operating on 40 channels near 27 MHz (11 m) in the high frequency (a.k.a.
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