In transmitter mode, the Bluetooth adapter can be paired with a Bluetooth headset or speaker. In receiver mode, it connects to traditional wired speakers, stereo receivers, or the auxiliary input port of a car audio system—enabling wireless audio streaming from your mobile phone or tablet. Features a TF card slot: Play audio directly from a TF card or stream wirelessly from your smart device. Compatible with older speakers, vintage stereos, and car audio systems via 3.5 mm or RCA cables. Bluetooth 5.0 technology: Offers improved transmission range, faster data transfer, and lower power consumption compared to previous versions. LED display shows Bluetooth status. Press the previous/next track buttons simultaneously to switch between transmitter and receiver modes. Plug-and-play operation: No external drivers required. Works universally with TVs and other audio devices—enabling Bluetooth connectivity for streaming to Bluetooth headphones, or turning your home stereo into a wireless receiver for audio from phones and tablets. Bluetooth specifications: Version 5.0 EDR, supporting A2DP, HSP, and AVRCP profiles. Operating frequency: 2.4 GHz – 2.48 GHz. Transmission range: Up to 10 meters. Reception range: Up to 10 meters. Charging voltage: DC 5V. Receiver function: Supports connection to one mobile phone. Transmitter function: Supports connection to one pair of Bluetooth headphones. Display: Shows up to 8 available devices for pairing (transmit mode) or paired device names (receive mode). Dimensions: 69 × 69 × 23.5 mm. Color: Black. Package includes: 1 unit.