Amazon.com: KZ PLUS Waterproof Aptx Bluetooth In-Ear Headphones Cables with Microphone Replacement for (KZ ZST ES3 ES4 ZSR ZS10 AS10) : Electronics
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Amazon.com: erjigo KZ HD Bluetooth Headphone/Earphone Wireless Cable with Microphone Replacement for (B PIN (KZ-ZST/ZS10/AS10/BA10/AS06/ES4/ZSR)) : Electronics
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Amazon.com: KZ PLUS Waterproof Aptx Bluetooth In-Ear Headphones Cables with Microphone Replacement for (KZ ZST ES3 ES4 ZSR ZS10 AS10) : Electronics
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Amazon.com: CCA KZ AZ09 Bluetooth 5.2 Module IEM Bluetooth Adapter Wireless Waterproof Ear Hook Extra Long Battery Life Bluetooth Cable for KZ ZS10 PRO/ZSN Pro X/ZSN PRO/ZSX/AS12/AS16/ZAX CRA/C12(C pin) : Electronics
KZ bluetooth cable mod. I didn't like the original wire with the $10 BT adapter (too long and rigid) so I soldered on the original harness. Will post some pics to imgur :
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