Infinity (JBL) Glide 4000, Wireless Over Ear Headphone with Mic, Upto 50Hrs Playtime, 40mm Dynamic Drivers, 4 EQ Modes, NFC, AUX & Bluetooth 5.0 with Voice Assistant Support for Mobile Phones (Black) :
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JBL GTO-4000 SM Service Manual download, schematics, eeprom, repair info for electronics experts