KN326 Bluetooth-compatible 5.0 Audio Transmitter Receiver 3.5mm AUX Jack RCA Wireless Music Audio Adapter with Mic for Car PC TV Headphones
Feature:
1.Support Microphone:Handsfree call when you are busy, cleanning
2.Transmitter mode:wirelessly streams audio from your non-Bluetooth-compatible TV, home stereo system, or CD player to your Bluetooth-compatible headphones or speakers
3.Receiver mode: wirelessly streams audio from your Bluetooth-compatible-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-compatible technology and 3.5mm audio cable (included).
5.Super-Portable Audio-Streaming Power
The KN326 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.

Instruction:
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: KN326 in the Bluetooth-compatible 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 KN326
2)confirm that it is in RX mode (blue light flash). Find the pairing name in the Bluetooth-compatible settings of the phone: KN326 click to pair.

TX mode: 
TX mode will automatically search for other Bluetooth-compatible receiving devices (such as Bluetooth-compatible headset, Bluetooth-compatible speaker, Bluetooth-compatible 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 KN326.
2)Confirm that it is in TX mode (red light flash). The KN326 will automatically search for Bluetooth-compatible headset or Bluetooth-compatible speaker pairing.

Specification:
Model: KN326
Style: 1, 2, 3
Technology: BT5.0, A2DP, AVRCP (receiver mode only).
Working range: up to 10m / 33ft (without obstacles).
Pairing name: KN326
Charging time: 2 hours
Working time: RX: 6 hours; TX: 5 hours
Battery type: lithium polymer (200mAh)
Size: 44x44x12mm/1.73x1.73x0.47"
Weight: 18g

Note:
There may be slight size deviations due to manual measurement, different measuring methods and tools.
The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor.