Bluetooth 5.0 Audio Receiver Transmitter AUX RCA 3.5MM 3.5 Jack USB Music Stereo Wireless Adapters Dongle For Car TV PC Speaker


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Model: KN321  

Technologies: BT5.0,A2DP, AVRCP (receiver mode only)  

Operation Range: Up to 10m / 33ft (without any blocking objects)  

Pairing name:KN321  

Charging Time: 2 hours  

Working Time: RX:6 hours ; TX:5 hours  

Battery Type: Li-Polymer (200mAh)  

Dimensions: 44 × 44 × 12mm   

Weight: 18g  



1.This extremely portable, lightweight wireless audio transmitter & receiver is an ideal wireless audio solution for a wide range of situations and uses  


2.Transmitter mode:wirelessly streams audio from your non-Bluetooth TV, home stereo system, or CD player to your Bluetooth headphones or speakers  


3.Receiver mode: wirelessly streams audio from your Bluetooth-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones  


4.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).  


5.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 & receiver into your backpack or laptop bag and take it on-the-go without the slightest effort.  


Power on: Press and hold the power on/off button until the LED lights up  

Shutdown: Press and hold the power on/off 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.  


Switch mode:  

1)RX: Receive mode, indicator: blue LED  

2)TX: Transmit mode, indicator light: red LED  


RX mode:  

Pairing name: KN321/KN319, find KN321/KN319 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/KN319 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/KN319.  

2)Confirm that it is in TX mode (red light flash). The KN321 will automatically search for Bluetooth headset or Bluetooth speaker pairing.  


Package Included:  

1* Bluetooth 5.0 Audio Transmitter/Receiver Adapter  

1* Micro USB Power Cable  

1* RCA Cable (PS: If you not selected the "with RCA Cable",RCA Cable will not included)  

1* 3.5mm AUX Audio Cable  

1* User Manual  



1.WORLDWIDE SHIPPING. (Except some countries and APO/FPO)  


2.Orders processed timely after the payment verification.  


3.We only ship to confirmed order addresses. Your order address MUST MATCH your Shipping address.  


4.The images shown are not the actual item and are for your reference only.  


5.SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays. Transit times may vary, particularly during the holiday season.  


6.If you have not received your shipment within 30 days from payment, please contact us. We will track the shipment and get back to you as soon as possible with a reply. Our goal is customer satisfaction!  


7.Due to stock status and time differences, we will choose to ship your item from our first available warehouse for fast delivery.  



1.You have 7 days to contact us and 30 days to return it from the date it was received. If this item is in your possession more than 7 days, it is considered used and WE WILL NOT ISSUE YOU A REFUND OR REPLACEMENT. There are NO EXCEPTIONS! Shipping cost is bear by both seller and buyer in half.  


2.All returned items MUST BE in the original packaging and you MUST PROVIDE us with the shipping tracking number, specific reason for the return.  


3.We will refund YOUR FULL WINNING BID AMOUNT, upon receipt of the item in its original condition and packaging with all components and accessories included, AFTER BOTH Buyer and Seller cancel the transaction from aliexpress. OR, you may choose to have a replacement.  


4.We will bear all the shipping cost if the product(s) is (are) not as advertised.  



1.12 months Manufacturer`s limited Warranty for defective items (excluding items damaged and/or misused after receipt). Accessories come with a 3-month warranty.  


2.Defective items MUST BE reported and returned within the warranty period (and in the original packaging, if possible). You must tell us what the defect is and give us your order number. WE DO NOT REPAIR OR REPLACE ITEMS WITH AN EXPIRED WARRANTY.  


3.You agree to all of the above-listed policies upon ordering on aliexpress!


1.Your feedback is very important to our Business's development,So please leave Feedback 5 Stars if you are satisfied with our products,Thank you very much.  


2.Don't leave Negative Feedback without asking us for help,please feel free to Contact with us first if you have any problem.Feedback is our life,before you leave a neutral or negative feedback,please do contact us to get a better solution,We will answer all messages as quickly as possible,Thank you in advance for your patience.  




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