@BA4QAO @yuzhou There are relatively few online reviews for the Aiduo UV-4R, and I only found one review by Dong Ge on Bilibili. There's also the Yisheng AR-55A, which is in a similar price range, has an FCC approval code, and doesn't include GPS. There are also some third-party reviews available for this model online. Could anyone provide a comparison recommendation between these two models?