1.This extremely portable, lightweight wirele audio transmitter & receiver is an ideal wirele audio solution for a wide range of situations and uses2.Transmitter mode:wirelely streams audio from your non-Bluetooth TV, home stereo system, or CD player to your Bluetooth headphones or speakers3.Receiver mode: wirelely streams audio from your Bluetooth-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones4.Switch between transmitter and receiver modes with the simple flick of a switch. Effortlely connect using advanced Bluetooth technology and 3.5mm audio cable (included).5.Super-Portable Audio-Streaming PowerThe KN326 is just 44mm (1.73") acro and weighs only 18g (0.63oz), but has got powerful wirele audio streaming capabilities. Slip this transmitter & receiver into your backpack or 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 Transmitter adapter can widely be used on your computer, laptop, home stereo system, headphone, smartphone, Mp3 player, CD player, etc. Power on: Pre and hold the power on/off button until the LED lights upShutdown: Pre and hold the power on/off button 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: Transmit mode, indicator light: red LED RX mode:Pairing name: KN326, find KN326 in the Bluetooth settings of the phone to pair. The blue light flashes twice a second during the pairing proce, and the blue light flashes once every three seconds after 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 KN3262)confirm that it is in RX mode (blue light flash). Find the pairing name in the Bluetooth settings of the phone: KN326 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 proce, and the red light flashes once every three seconds after 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 KN326.2)Confirm that it is in TX mode (red light flash). The KN326 will automatically search for Bluetooth headset or Bluetooth speaker pairing.Bluetooth handsfree callingIn the receiving mode, this product supports Bluetooth hands-free calling. When the mobile phone calls, short pre the power button to answer the call. Specifications:Model: KN326Technologies: BT5.0, A2DP, AVRCP (receiver mode only)Operation Range: Up to 10m / 33ft (without any blocking objects)Pairing name:KN326Charging Time: 2 hoursBattery Type: Li-Polymer (200mAh)Dimensions: 44 × 44 × 12mm Package Content1x Bluetooth 5.0 Audio Transmitter/Receiver Adapter1x Micro USB Power Cable1x RCA Cable1x 3.5mm Aux Cable1x User Manual