The radio relay is GMRS frequency; please tell us before if you need customized frequency version Upgraded feeder cable;which can reduce 1-2W power loss;the new cable's size is 10.62mm; much larger than the previous 4.88mm The RT97 GMRS base station repeater is easy to carry and support multiple power options;wide signal coverage and strong penetration;easy to install and operate;mobile base station can be operated flexibly as fixed or mobile The built-in duplexer can receive and transmit signals at the same time; you just need to match one antenna to transfer the signal of the walkie talkies; this package does not include an antenna With 16 channels;8 of them are default GMRS channels that have been set; it can compatible with NR30S;RB48P;RT76P;RB26 and many other retevis models Radio repeater power divider with LCD screen supports icon display of selected functions;including channel information; TX and RX frequency display The compact and rugged radio repeater is drop-