Item Type: Audio AdapterMPN: Not SupportedMaterial: PVCBluetooth Standard: Bluetooth V 5.0Bluetooth Version: V5.0Connection Method: WirelessConnector A: USBConnector B: 3.5mm JackBuilt-In Polymer Lithium Battery: 140mAh (Battery Included)Package List1 x Audio Adapter1 x Charging Cable1 x 3.5mm Audio Head1 x Manual1AUX Bluetooth receiver transmitter, lossless sound quality, brings you an excellent listening experience. 2To be a Bluetooth TV, it has a 3.5mm audio interface to connect to the TV and transmit sound to the headset via Bluetooth. 3To be a Bluetooth speaker, it can be connected to a 3.5mm audio port, and the speaker without Bluetooth function can also be played wirelessly. 4Lightweight appearance, small and portable, can be easily held and used in various places. 5Simple operation, just follow the stepbystep instructions on the manual, you can use it easily.