About Retevis H777 FAQ on Retevis H777 FRS Portable Two-Way Radio for Sale. 10X Retevis H777 walkie talkie. Stray Radiation -36dBm＜1GHz，-30dBm＞1GHz. ▶ H-777 4.0 designed for strong compatibility with H-777 2.0 & 3.0 version and other Retevis FRS two way radios; like RT22; RT68; H-777S; B3H etc; facilitating team communication.
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