Features:1.This extremely portable, lightweight wirele audio nsmitter & receiver is an ideal wirele audio solution for a wide range of situations and uses2.nsmitter mode:wirelely streams audio from your non-TV, home stereo system, or CD player to your headphones or speakers3.Receiver mode: wirelely streams audio from your-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones4.Switch between nsmitter and receiver modes with the simple fliof a switch. Effortlely connect using advanced technology and 3.5mm audio cable (included).5.r-Portable Audio-g PowerThe KN321 is just 44mm (1.73”) acro and weighs only 18g (0.63oz), but has got powerful wirele audio g capabilities. Sl this nsmitter & receiver into your backpaor laptop bag and take it on-the-go without the slightest effort.6.Broad Compatibility: With the included 3.5mm cable and 3.5mm to 2RCA cable, this Receiver nsmitter adapter can widely be used on your computer, laptop, home stereo system, headphone, smartphone, Mp3 player, CD player, etc.Specifications:Model: KN321Technologies:5.0, A2DP, AVRCP (receiver mode only)Operation Range: Up to 10m / 33ft (without any blocking objects)Pairing name:KN321Charging Time: 2 hoursBattery Type: Li-Polymer (200mAh)Dimensions: 44 × 44 × 12mmWeight: 18gPackage Content:1 x 5.0 Audio nsmitter/Receiver Adapter1 x Micro USB Power Cable1 xA Cable1 x 3.5mm Aux Cable1 x Multilingual instruction manualUsage :Power on: Pre and hold the power on/off on until the LED lights upShutdown: Pre and hold the power on/off on until the LED is offCharging: 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 LED2)TX: nsmit mode, indicator light: red LEDRX MODE:Pairing name: KN321, find KN321 in the settings of the phone to pair. The blue light fes twice a second during the pairing proce, and the blue light fes once every three seconds ar the pairing is succeful.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 f). Find the pairing name in the settings of the phone: KN321 pair.TX MODE:TX mode will automatically search for other receiving devices (such as headset, speaker, receiver, etc.), The red light fes twice a second during the pairing proce, and the red light fes once every three seconds ar the pairing is succeful.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 f). The KN321 will automatically search for headset or speaker pairing.