The Avantree Oasis+2 Bluetooth Transmitter is compatible with your LG OLED65CX TV, provided you connect the transmitter to your TV's audio output. It supports connections via optical cable, 3.5 mm jack or RCA, which correspond to the standard audio outputs of TV sets. We recommend that you set your TV's audio output to PCM/LPCM format for optimum compatibility with the transmitter. You'll also be able to transmit sound from your TV to Bluetooth headphones or speakers without any noticeable latency, thanks to the aptX Low Latency codec supported by the transmitter.