Why does only one earphone have sound?. Bluetooth 5.3 Technology: Adopt the advanced Bluetooth 5.3 Technology. IT100 PLUS wireless earphones support HSP, HFP, A2DP, AVRCP, which greatly improve the transmission speed and providing you with a low-latency listening experience, stable connection(80% more stable than the last generation) and signal transmission (33ft no-obstacle range).
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