If there are obstacles such as hills, buildings, between the calling and receiving walkie talkies, it is difficult for the walkie talkies to work properly.The radio relay combination kit can solve the line-of-sight problem in traditional communication. Extend the communication range of the radio in your hand and make your reception clearer and more stable. How to use Connect the radio relay to the antenna and coaxial cable, plug it into the home power supply and it will work (the higher the antenna is erected, the wider the coverage of the radio relay signal). By adjusting the walkie talkies and the radio relay to the same channel, the relay of the walkie talkie signal can be realized. Can be used as a mobile radio relay: powered by the cigarette lighter interface on the car, or use a portable charging station to power the radio relay, you can keep in touch with your friends at any time outdoors where there is no mobile phone signal.It can be used as a fixed base station: at home or in the workplace, the omnidirectional antenna can be built at a height such as the roof, so that the signal can cover the entire community or large factory warehouse without worrying about the attenuation of the walkie-talkie signal through multi-layer obstacles. Long range handheld walkie talkies RT29 walkie talkie features high penetration, it uses high-powered radio frequencies that penetrate physical obstacles such as building walls, vehicles and trees. High performance battery 3200mAh battery make sure the call duration is up to over 24 hours use. Clear sound quality Speaker dust-proof design can keep the sound quality always clear. Rugged design It can stand up to harsh job-site conditions at construction site and warehouse and can withstand 2-meter drop.