Wide compatibility Audio receiver for headphones and home/car stereo Works with most devices such as phones, tablets, laptops, and most speakers The standard 3.5 mm audio adapter is suitable for powered PC speakers, car/home stereo systems, and wired headphones Mini Bluetooth 5.1 Audio Adapter Uses upgraded Bluetooth 5.1 technology for improved connection stability and reduced delay Convert nonBluetooth devices to Bluetoothenabled devices Inear headphones can effectively isolate noise and provide easier music listening Dual mode and lossless playback Two modes: Bluetooth and TF card Supports WAV, FLAC, and APE lossless formats Largecapacity lithium battery provides about 20 hours of playback LED realtime power display to show current power level Safe hands calling Enables hands calling while driving Noise cancellation reduces environmental noise for clearer calls Voiced picked up more accurately, with CDquality sound experience Use scenarios In the car: connect to the car stereo via Bluetooth or 3.5 mm, use for hands calls and streaming music from a smartphone At home or in the office: upgrade wired speakers or headphones to Bluetooth wireless playback, or use TF card playback for offline listening On the go: use TF card mode to play lossless audio during travel or commuting, with long battery life and clear call quality when needed