It works fine with Rino 530Hcx. There is a single ear "ear-bud" = mono speaker. PTT = Push to Talk switch works the way it should with Rino 530. Price is acceptable(not bargain) for what you are getting. Uses 2.5mm 3-conductor plug (Mono speaker + mic).
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I haven't had much time to use the earbud with microphone, but from what I have used it, it works well. It's fairly robust, the only thing I worry about is pulling too hard on the wires from the earbud to the GPS, like all stereo headset users can attest, it is too easy to damage the headset by accidentally pulling the wires. I do not know if this is the case here or if it would just pull out of the receiver. But other then that long term worry, the earbud/microphone works well.
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I bought two sets of these for our garmin radios that were used during hunting. One worked while the other cut out and didn't seem to operate correctly. I will have to return for an exchange.
I have had better quality ear buds for other radios, too bad Garmin couldn't follow the other models.
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