Golvery Bluetooth 5.0 Transmitter And Receiver, 2 In 1, 2 Devices Pairing ??2-in-1 Bluetooth Adapter?In TX mode, it is used to connect to the non-Bluetooth devices like TV/PC/DVD/CD/MP3/Projector and other music player, transmit audio to Bluetooth headphones/speakers. In RX mode, it is paired with smartphone, tablet, iPad, laptop to play music to home theater/sound bar/wired speaker. ??No Audio Delay?Compatible with APTX-LL and FastStream codec to support low latency audio. Reduces the audio delay to unnoticeable 40ms. Provides no lip sync delay audio experience. NOTE: to achieve low latency function, the pairing Bluetooth headphone/speaker must support APTX-LL or FastStream codec. The APTX-codec is not a low latency codec. ??Great Quality Stereo Sound?Equipped with advanced Bluetooth chipset and latest Bluetooth V5.0 technology. Upgrading the old non-Bluetooth audio devices to enable Bluetooth function, provides fast transmission and stable connection. Ensure to offer high-quality stereo sound. ??Multi-Connection?Supports up to 2 Bluetooth headphones/speakers simultaneously in TX mode; Realizes low latency function if both headphones can support APTX-LL or FastStream codec. Can be paired with two Bluetooth sound source like smartphone or tablet in RX mode. But it can only receive sound from only once device. Convenient to switch. ??Working While Charging?The built-in rechargeable battery can last working for 14 hours after a 2-hour full charge. But our BTI-018 can work fine while it is charging. It will power off to reset when you plug the USB cable to charge it. Please turn it on to make it continue to work while charging.