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I bought FX Radar Chronograph and used it in FX Impact, but it doesn't respond at all. Of course Bluetooth is connected. Can you give me some advice, even if it's a trivial matter?

I would like the advice of experienced people. I don't really understand the difference between FX Impact and Maverick. Ignore the price and tell me the good points and bad points of each, and which one is recommended if you buy from now on.