Baofeng UV-5R UV dual band walkie talkie. Handheld radios in this frequency band are generally FM modulated, with UHF frequencies of 400-470 MHz and VHF frequencies of 136-174 MHz. Due to the significant attenuation of VHF in the city, UHF can penetrate buildings well in the city, so this test only tests UHF frequency, and the VHF frequency will be tested next time in the wilderness.