Item Type: Bluetooth ReceiverMaterial: PlasticProduct Color: BlackBuilt in Lithium Battery: 140mAhWorking Range: Approx. 10m/393.7in (Without Obstacles)Charging Time: 1hUse Time: 4hApplicable Type: Computer, TV, Projector (Broadcast Mode)/Speaker, Earphone (Receiving Mode)Package List1 x Manual1 x 3.5mm Audio Head1 x Charging Cable1 x Bluetooth Transmitter Receiver1This wireless receiver transmitter is very durable, which has 4 hours battery life, lossless sound quality, hands free call. And it can plug and play, with auxiliary interface. 2Connect the 3.5mm audio interface of the TV to wirelessly stream the sound to the earphones, so you don't have to worry about disturbing your family when you watch movies at night. 3This product is practical, can be connected to the car audio, not only can make calls, but also can listen to dynamic music, so that your journey will no longer be lonely. 4CD level lossless sound quality: high resolution lossless sound quality restoration, bringing only a CD level music experience, you can listen to music on your mobile phone. 5This wireless receiver has a builtin rechargeable lithium battery, which can be charged once, and can be used for 4 hours in low battery, which is convenient and worry free.