SpecificationsModel: KN321Technologies: BT5.0,A2DP, AVRCP (receiver mode only)Operation Range: Up to 10m / 33ft (without any blocking objects)Pairing name:KN321Charging Time: 2 hoursWorking Time: RX:6 hours ; TX:5 hoursBattery Type: Li-Polymer (200mAh) Features: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 KN321 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. 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: KN321, find KN321 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 KN3212)confirm that it is in RX mode (blue light flash). Find the pairing name in the Bluetooth settings of the phone: KN321click 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 KN321.2)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 Adapter1* Micro USB Power Cable1* RCA Cable1* 3.5mm AUX Audio Cable1* User Manual