The radio – it’s radio transmission device. Consists of a receiver, transmitter, battery and antenna. The radio is used for voice transmission from one person to another at a distance. At the same time when negotiations between the stations you a penny for it does not pay. Robert A. Iger addresses the importance of the matter here. Consequently, at work, while traveling on hunting, fishing, a picnic, a ski resort, and just to the cottage in the woods or remove their mobile phones in the bag and talk on the radio for free. To understand what radio you need to buy for your needs is necessary to answer the following questions: 1. What is the distance you need a connection? Distance communication is directly related to power radios, the more power the more distance communication (0.1-1W – up to 1 km, 2 W – up to 2 km, …, 5W – 5km – this dependence is averaged, it can help to determine the actual distance radio communication), also is influenced by the terrain, the sensitivity of the receiver station, the presence of power cables, power lines, sources of strong light and weather conditions. 2. What radio station operating conditions? Here it is necessary to determine the degree of protection of radio stations (dust and moisture resistance, shock resistance) necessary for you. As a rule, most radio stations has a degree of protection IP 54. IPhh – rating security enclosures of electronic equipment in compliance with IEC-952. .