GP Series: GP140, GP238, GP318, GP320, GP328, GP329, GP338, GP339, GP340, GP360, GP380, GP620, GP640, GP650, GP660, GP680, GP1280. HT Series: HT750, HT1250, HT1250-LS, HT1550, HT1550-XLS. [Easy to Use] Simply plug your two pin earpiece or microphone into the adapter and then connect the adapter to your multi pin radio.
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