KZ AZ09 2-Pin B-Pin Wireless Bluetooth 5.2 Adaptor Earphone Upgrade cable,Amazon.com: KZ AZ09 PRO Bluetooth 5.2 Module IEM Bluetooth Adapter Waterproof Ear Hook Extra Long Battery Life Bluetooth Cable for KZ ZS10 PRO/ZSN ,KZ AZ09 Pro – KZ ACOUSTICS,Amazon.com: KZ AZ09 PRO Bluetooth 5.2 Module IEM Bluetooth Adapter Waterproof Ear Hook Extra Long Battery Life Bluetooth Cable for KZ ZS10 PRO/ZSN ,Amazon.com: KZ AZ09 Pro IEM Headphone Bluetooth Adapter, Bluetooth Module Upgrade Ear Hook Replacement Cable for ZS10Pro ZSNPro ZAS Zax, 0.75/0.78mm 2Pin Connector (Black, with Mic) : Electronics