・This portable and lightweight wireless audio transmitter and receiver is the ideal wireless audio solution for every situation and application,and can be used with computers,mobile phones,televisions,home speakers,and car speakers ・Use the latest Bluetooth-compatible 5.0 technology,the adapter has the fast transmission speed and high-quality stereo music,so you cna enjoy the convenience of Bluetooth-compatible technology for life ・Use the TX or RX switch to switch modes,TX is the transmission mode(red LED). RX is the receiver mode(blue LED) ・Insert USB power,the red light is on in the transmitting mode,the red light flashes when pairing,and the red light is always on after the pairing succeeds ・Insert USB to power on,the receiving mode is blue light,the blue light flashes when pairing,the blue light is always on after pairing is successful ・When you use it on your computer,no need audio cable and no driver required,plug and play (only audio can't transmit data) Specifications: ・Model: KN330 ・Technologies: BT5.0,A2DP,AVRCP (receiver mode only) ・Operation Range: 10m (without any blocking objects) ・Pairing name(Receiver mode ): KN330 ・TX: Transmitter mode,red LED light is on ・RX: Receiver mode,blue LED light is on ・Dimensions: 45 x 20 x 11mm Package included: ・1 x KN330 Bluetooth-compatible 5.0 Audio Receiver Transmitter 2-in-1 Bluetooth-compatible 5.0 Receiver 3.5mm Audio Transmitter ・1 x 3.5mm Audio Cable ・1 x English Manual ・Other items not included