Compatibility: This earpiece is designed to fit for SL300, SL500, SL4000, SL4010, SL7550, SL7580, SL7590, SL8050, SL8550, SL1K, SL1M 2 way radios, ensuring a nice fit. Application: Fit for SL300 SL500 SL4000 SL4010 SL7550 SL7580 SL7590 SL8050 SL8550 SL1K SL1M Radio.
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