1、 3 in 1 Transmitter Receiver: The USB Bluetooth 0 audio transmitter receiver can transmit audio from non-Bluetooth audio sources (TV, PC, MP3, CD player or book reader, etc.) to Bluetooth headsets and speakers. And you can also make your non-Bluetooth headsets and speakers receive audio from Bluetooth audio sources (mobile phones, tablets, etc.). You can easily switch between transmitter and receiver modes with the push of a button! 2、 Easy to Use: Just tap the switch to switch between transmitter and receiver modes. Easy connection using advanced Bluetooth technology and 5mm audio cable (included). 3、 Bluetooth0 + EDR: By inserting a Bluetooth adapter into a non-Bluetooth device to achieve wireless connection with various Bluetooth devices. It can be stably connected to TVs, stereos, PCs, MP3s, cars, speakers, earphones, smartphones, tablets, and reaches a maximum range of 50 feet (15m) outdoors and a maximum range of 33ft (10m) indoors. 4、 USB Power Supply: THe USB has a power supply function. During use, power must be supplied through USB ports (such as power adapter, PC, car charger and other USB ports). As long as the receiver of the Bluetooth transmitter is powered on, you don't have to worry about running out of power while listening to music. 5、 Portable Bluetooth Adapter: The compact design and portable function allows you to carry the audio transmitter anywhere, very suitable for outdoor activities such as running and hiking. 6、 1*5.0 Bluetooth Receiver Transmitter 1*3.5MM Audio Cable 1*User Manual Name: Audio Bluetooth Adapter Model: SY319 Colour: black Input voltage: DC 5V Transmission distance: maximum 10 meters/33 feet (no obstacles) Bluetooth version: 5.0+EDR Input interface: 3.5mm audio Driver: no need to install Transmitter mode: red LED light is on Receiver mode: blue LED light is on Mode switching: switch the mode by switching the TX/RX switch, click the button Range of use: This Bluetooth adapter can be used in almost all digital products with audio input/output ( 3.5MM audio interface), just connect the audio to the input/output port. Size: about 45*20* 9.5mm/ 1.77* 0.79* 0.37in Net weight: about 12g Gross weight: about 28g