The frequency of most of the handheld walkie-talkie on the market is 400-470MHz, and the max output power is 5W which the effective talking range is about 5-8KM(only in wide-open area). In some area such as in the city with tall buildings, the range is only 1-2 km, in some case it got only few hundred meters!
In order to realize the long-distance communication, we need repeater. But the price of normal manufacturer of repeater is very high, so this new type repeater is just launched! The operation is very simple, it's without power supply! And do not need to change any part of the radio. All you need is just two handheld radios, put the jack into the headset and the speaker mic (2.5mm&3.5mm) with this radio repeater box, it become a very practical small repeater!!
With this RPT-12D Two Way Radio Repeater Box, both of the Motorola radios can transmit and receive in VHF band or UHF band.