Transform your audio experience with the BT‑21 Bluetooth 5.0 Transmitter Receiver, a versatile 2-in-1 Bluetooth adapter designed to enhance connectivity and sound quality. This innovative device is perfect for anyone looking to upgrade their audio setup without replacing existing equipment. Explore the features that make this adapter a must-have: 2 in 1 Bluetooth Adapter: Seamlessly switch between TX and RX modes. In TX mode, connect the Bluetooth transmitter to non-Bluetooth devices like TVs, PCs, and MP3 players via AUX or RCA, and transmit audio to Bluetooth headphones, speakers, or soundbars. In RX mode, connect the Bluetooth receiver to wired speakers or earphones to receive audio from smartphones via Bluetooth. Stable Connection and Stereo Sound: Equipped with the latest Bluetooth chip and software, this adapter ensures a stable connection and delivers a CD-like auditory experience. Enjoy easy pairing with NFC-equipped phones for a quick and hassle-free connection. Widely Compatible: Featuring rich interfaces such as RCA and AUX, this Bluetooth 5.0 receiver transmitter connects effortlessly to any active speaker with a standard 3.5mm port or 2RCA port. It's ideal for home theaters, stereo systems, car speakers, smartphones, and Android devices. Work While Charging: The built-in battery supports up to 8 hours of receiving and 5 hours of transmitting on a full charge. When the battery is low, simply plug the adapter into a power source to charge while continuing to use it, ensuring uninterrupted audio enjoyment. Support Auto Startup Shutdown: Conveniently use the charging cable to connect the adapter to your car or other power sources. The device automatically powers on and connects to the last paired device when the car starts or receives power, and it shuts down automatically when the car is turned off. Upgrade your audio connectivity with the BT‑21 Bluetooth 5.0 Transmitter Receiver, and enjoy the freedom of wireless audio with exceptional sound quality and convenience. Whether at home or on the go, this adapter is your perfect audio companion.