Product Features This extremely portable , lightweight wireless audio transmitter and receiver is an ideal wireless audio solution for a wide range of situations and uses. Transmitter Mode: Wirelessly streams audio from your non-Bluetooth TV, home stereo system, or CD player to your Bluetooth headphones or speakers. Receiver Mode: Wirelessly streams audio from your Bluetooth-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones. Switch between transmitter and receiver modes with the simple flick of a switch. Effortlessly connect using advanced Bluetooth technology and 3.5mm audio cable (included). Super-Portable Audio-Streaming Power: The KN321 is just 44mm (1.73 ) across and weighs only 18g (0.63oz), but has got powerful wireless audio streaming capabilities. Slip this transmitter into your backpack or laptop bag and take it on-the-go without the slightest effort. Wide Compatibility: With the included 3.5mm cable and 3.5mm to 2RCA cable, this Receiver Transmitter adapter can widely be used on your computer, laptop, home stereo system, headphone, smartphone, Mp3 player, CD player, etc. How To Use Power on: Press and hold the power on button until the LED lights up. Shutdown: Press and hold the power on button until the LED is off Charging: Use the DC-5V charger and micro USB charging cable. The red light is on during charging. When the battery is fully charged, the blue light is on. Note Switch Mode: 1)RX: Receive mode, indicator: blue LED 2)TX: Transmit mode, indicator light: red LED RX Mode: Pairing name: KN321, find KN321 in the Bluetooth settings of the phone to pair. The blue light flashes twice a second during the pairing process, and the blue light flashes once every three seconds after the pairing is successful. How to Use: 1)Plug one end of the audio cable into the audio input of the speaker and the other end into the audio of the KN321 2)confirm that it is in RX mode (blue light flash). Find the pairing name in the Bluetooth settings of the phone: KN321 click to pair. TX Mode: TX mode will automatically search for other Bluetooth receiving devices (such as Bluetooth headset, Bluetooth speaker, Bluetooth receiver, etc.), The red-light flashes twice a second during the pairing process, and the red-light flashes once every three seconds after the pairing is successful. How to Use: 1)Plug one end of the audio cable into the audio output of the devices and the other end into the audio of the KN321. 2)Confirm that it is in TX mode (red light flash). The KN321 will automatically search for Bluetooth headset or Bluetooth speaker pairing. Product Specification Type Bluetooth 5.0 Audio Transmitter Adapter Technology BT5.0, A2DP, AVRCP (receiver mode only) Operation Range Up to 10m 33ft (without any blocking objects) Charging Time 2 hours Working Time 4 hours Battery Type Li-Polymer (200mAh) Dimensions 44 44 12mm Weight 18g Package Included 1 x Bluetooth 5.0 Audio Transmitter Adapter 1 x Micro USB Power Cable 1 x RCA Cable 1 x 3.5mm Aux Cable 1 x User Manual Location In order to improve buyer's purchasing experience and let the buyer receive items as soon as possible, we currently set four warehouses in diffirent cities of United States : one in Fremont, California; one in CITY OF INDUSTRY, California; one in Whippany, New Jersey; one in Monroe Township, New Jersey. When the order is generated, we would send the item to the buyer from the nearest warehouse with sufficient inventory to the order receiving address. Hope you could get your item soon,if you have any problem,please contact us by email. Thanks for your understanding and support in advance! Support & Share