Special feature: 1. Check Compatibility for Personal Listening Devices First! Auracast & Multi-Listener Compatible; 3. Firmware Upgradable 1. Firmware Upgradable1. Firmware Upgradable See more. Avantree Audikast 4 - Auracast & Bluetooth 5.4 TV Transmitter 2-in-1 for Headphones & Selected Personal Listening Devices, aptX Adaptive & HD, Optical & AUX Output, Future-Ready & Upgradeable.
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