Bluetooth adapter is not only a transmitter, but also a receiver. In TX mode, you can listen wirelessly music from your TV, computer and more. In RX mode, your wired headphones, speakers and the old stereo system immediately have wireless and Bluetooth functions . With Bluetooth 5.0 chip installed, USB Bluetooth adapter has a better performance than the previous version in terms of wider transmission distance, faster data rate, and lower power consumption. Plug and play, bluetooth transmitter and receiver without installing any external driver. Universal Bluetooth audio adapter makes your TVs and other devices Bluetooth enabled to stream audio to your Bluetooth headphones, or makes your home stereo bluetooth rephone enabled to receive the and tablet. Long working time and easy to carry, it can work continuously during charging. While it only needs to be charged for 2 hours, the working time is approx. 8 hours. The maximum range is up to 10 meters (without obstacles). Ultra- light and small, you can take it anywhere. Bluetooth version: 5.0 Supported protocols: RX: A2DP, AVRCP, HFP TX: A2DP Working frequency band: 2.402GHz -2.480GHz Power level: Power level 2 (Class II) Audio coding: SBC Working current: RX22MA TX35MA Built-in battery: 250MAH Charging current: about 200MA Charging time: about 2 hours Battery life: RX12H, TX7H Bluetooth distance: 10M (open space) Charging method: Micro USB 5V/0.5A Input / output connection mode: AUX interface Compatible with: Android, IOS system mobile phones and PADs, and Bluetooth speakers or headphones that support the A2DP protocol Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item Please allow 0.1-1cm difference due to manual measurement, thanks Other accessory demos in pictures are not included. Size: 52*52*13mm Shipping color: black Shipment Quantity: 1