Product Features: 3 in 1 Bluetooth Audio adapter- have you ever thought about bringing your TV, projector or vintage stereo system into the Bluetooth age? This VIKEFON B22 or B21 Bluetooth transmitter receiver will make it happen. It has 3 modes(tx, RX and bypa) that can Bluetooth-enable nearly all the Audio devices in your home, such as your TV, iPod, PC, old home stereo or speakers. In this way, you will be able to get rid of wires and enjoy high quality wirele audio freely throughout your home.262ft Ultra long range- utilizing the latest Bluetooth 5. 0 technology and dual Antennas design, Visoud Bluetooth adapter can achieve a range of up to 262ft(80m) line-of-sight in open air and up to 80-110ft(25-35m) indoors, which ensures a stable connection without losing signal wherever you go in your big house. *Note: operation range can be affected by Wi-Fi routers, wirele TV adapters and also depends on the receiving devices.No lip Sync delay & dual Link- features aptX HD to ensure a better-than-cd listening experience and aptX Low Latency to virtually eliminate audio-visual lag, This Bluetooth Audio transmitter is ideal for watching TV/movies. Also, it can connect with two Bluetooth headphones at the same time, that means you can share the great fun with your family or friends without disturbing any others. *Note: to achieve low Latency, your receiving device must also support aptX Low Latency.Large battery capacity- Thebuilt-in 1000 mAh batterymakes it portable, this Bluetooth receiver takes only 4.5 hours to be fully charged but allows for 15 hours in TX mode&20 hours in RX mode of solid use, that will be enough for listening all day or on a long road trip, you can also use it while charging. Note: This product will automatically enter the dormant and power-saving mode after 6 minutes without connection.Nfc & multiple connection- supports NFC for fast Link and comes with optical cable, 3.5 mm aux and RCA Audio cable to satisfy all your connection needs, It is compatible with almost all tv's and Audio systems that have an Audio input, and the volume adjust function can be used for many devices which do not have their own volume controls.Why should you choose this item?Long Range: BT-B22 OR BT-B21long range Bluetooth adapter can help to achieve 262ft(80m) line-of-sight in the open air and UP TO 80-110FT (25-35M) INDOORS.No lip sync delay & Perfect Hi-Fi sound:AptX Low Latency technologyeliminate Bluetooth audio delay, so you can enjoy high-clarity sound and watch TV / Movie / Video in perfect synchronization. aptX HD technology provide you perfect sound experience.Dual Stream: Dual link feature ofBT-B22 OR BT-B21Bluetooth adapter alsoenables simultaneous streaming to 2 headphones or speakers.Bluetooth Extender: Extend Bluetooth range by cabled to weak wirele audio devices, or pair with another Bluetooth adapter to boost Bluetooth singleBypa with 4 different work modes: 1) Aux in/Aux out: Aux LED on. 2) Opt in/Opt out: Opt LED on. 3) Aux in/Opt out: Aux LED flash first and then Opt LED on. 4) Opt in/Aux out: Opt LED flash first and then Aux LED on.NFC Function: Put cellphone next toBT-B22 OR BT-B21wirele Bluetooth receiver transmitter which in pairing mode, simplify the pairing! Don't need to pair manually *NOTE: Please make sure your mobile phone with NFC function and on.The function only be supported by RX mode.Pair with each other : Support work with each other, One as a transmitter, the second - as a receiver.Package contents:1 x Bluetooth Transmitter/Receiver Adapter1 x Micro USB charging cable1 x 3.5mm audio cable1 x 3.5mm jack to 2 RCA plug cables1 x Digital Optical Toslink Audio Cable1 x user manual