Item Type: Bluetooth USB Transmitter_x000D_ Material: ABS_x000D_ Color: As Picture Shown_x000D_ Size: Approx. 32x17x8.5mm/1.3x0.7x0.3in_x000D_ Weight: Approx. 21.0g/0.7oz_x000D_ Bluetooth Version: BT5.1, A2DP, AVRCP_x000D_ Use Distance: 10m_x000D_ Pairing Name: for KN318_x000D_ Pairing: Blue LED Light Flashes_x000D_ Pairing Successfully: Blue Light Keeps on1USB mode does not need to use 3.5mm cable, directly plug into the car or speaker USB port, and can be used directly after pairing with phone Bluetooth. 2In AUX mode, connect one end of the 3.5mm cable to the adapter, and the other end to the the car or speaker, and use directly after pairing with phone Bluetooth. 3Built?in microphone, you can make hands?free calls through the microphone on the adapter, which is very convenient to use in the car. 4Connect the speaker with a transmission range of up to 10m/32.8ft, enjoy the original sound. 5Small, lightweight and portable, convenient for carry and storage, plug and play, easy to operate.The USB playback mode can only be used when the car or speaker USB interface supports USB audio output1 x BluetoothUSB Transmitter 1 x 3.5mm Audio Cable 1 x Manual