3-IN-1 Bluetooth Receiver and Transmitter, a single one with both transmitting and receiving functions, is enough to deal with most situations for Bluetooth audio transmission. ?Transmitter Mode? Transmit stereo audio wirelessly from your non-Bluetooth audio sources to your Bluetooth-enabled headphones, speaker or receiver.Enable you enjoy high quality music wirelessly without disturbing others?Receiver Mode? Receiver offers an economical solution by turning your old wired headphones or speakers into Bluetooth headphones or speakers.Now, you can enjoy CD-like audio quality wirelessly on your home stereo or wired speaker.Why you need this product? ?This product has transmitter mode and receiving mode. ?For example, you have a car or older hifi that cannot receive Bluetooth signals, or if you want to use an existing non-Bluetooth headset for a new iPhone. ?The transmitter mode can be used on an airplane (if you want to use your own Bluetooth headset instead of the one provided by the airline),or if you have like a very old iPod without Bluetooth and you want to connect to a Bluetooth speaker.or you want to watch TV with a Bluetooth headset but the TV does not have Bluetooth. ?When you have this product, you don?t need to spend expensive money to buy Bluetooth-enabled device again, which saves more money.Specification: Bluetooth version: Bluetooth 5.0 Bluetooth distance: 10M (free space) Built-in battery: 260mAh (charging time: about 1 hour) Play time: 6 hours as receiver and 8 hours as transmitter Charging input voltage: DC 5V (Note: Please do not use a voltage higher than 5V to charge the device.)Package Included: 1 x 3.5mm Bluetooth V5.0 Adaptador 1 x USB to micro USB charging cable 1 x 3.5mm AUX Audio Cable 1 x User Guide