Note: Due to the different monitor and light effect,the actual color maybe a slight different from the picture color._x000D_Please allow 1-2cm differs due to manual measurement. Specification: Name: Audio Bluetooth Adapter_x000D_Model: SY319_x000D_Colour: black_x000D_Input voltage: DC 5V_x000D_Transmission distance: maximum 10 meters/33 feet (no obstacles)_x000D_Bluetooth version: 5.0+EDR_x000D_Input interface: 3.5mm audio_x000D_Driver: no need to install_x000D_Transmitter mode: red LED light is on_x000D_Receiver mode: blue LED light is on_x000D_Mode switching: switch the mode by switching the TX/RX switch, click the button_x000D_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._x000D_Size: about 45*20*9.5mm/1.77*0.79*0.37in_x000D_Net weight: about 12g_x000D_Gross weight: about 28g Features: 11. 3 in 1 Transmitter Receiver: The USB Bluetooth 5.0 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_x000D_2. Easy to Use: Just tap the switch to switch between transmitter and receiver modes. Easy connection using advanced Bluetooth technology and 3.5mm audio cable (included). 3_x000D_3. Bluetooth5.0 + 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_x000D_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_x000D_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_x000D_ PackageList: 1*5.0 Bluetooth Receiver Transmitter _x000D_1*3.5MM Audio Cable _x000D_1*User Manual