(KN319 Bluetooth 4.2 Adapter)
Features:
1.This extremely portable, lightweight wireless audio transmitter & receiver is an ideal wireless audio solution for a wide range of situations and uses
2.Transmitter mode：wirelessly streams audio from your non-Bluetooth TV, home stereo system, or CD player to your Bluetooth headphones or speakers
3.Receiver mode： wirelessly streams audio from your Bluetooth-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 technology and 3.5mm audio cable (included).
5.Super-Portable Audio-Streaming Power
The KN319 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.
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

Specifications:
Model: KN319
Technologies: BT4.2, A2DP, AVRCP (receiver mode only)
Operation Range: Up to 10m / 33ft (without any blocking objects)
Charging Time: 2 hours
Continuous Use Time: 6 hours (Receiver Mode) / 5 hours (Transmitter Mode)
Battery Type: Li-Polymer (200mAh)
Dimensions: 44 × 44 × 12mm
Weight: 18g

Package Content:
1x Bluetooth 4.2 Audio Transmitter/Receiver Adapter
1x Micro USB Power Cable
1x RCA Cable
1x 3.5mm Aux Cable
1x User Manual

(KN321 Bluetooth 5.0 Adapter)
Features:
1.This extremely portable, lightweight wireless audio transmitter & receiver is an ideal wireless audio solution for a wide range of situations and uses
2.Transmitter mode：wirelessly streams audio from your non-Bluetooth TV, home stereo system, or CD player to your Bluetooth headphones or speakers
3.Receiver mode：wirelessly streams audio from your Bluetooth-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 technology and 3.5mm audio cable (included).
5.Super-Portable Audio-Streaming Power
The KN321 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.
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.
and thered 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 thedevicesand the other end into the audio of the KN321.
Confirm that it is in TX mode (red light flash). The KN321 will automatically search for Bluetooth headset or Bluetooth speaker pairing.

Specifications:
Model: KN321
Technologies: BT5.0, A2DP, AVRCP (receiver mode only)
Operation Range: Up to 10m / 33ft (without any blocking objects)
Pairing name:KN321
Charging Time: 2 hours
Battery Type: Li-Polymer (200mAh)
Dimensions: 44 × 44 × 12mm
Weight: 18g

Package Content:
1 x Bluetooth 5.0 Audio Transmitter/Receiver Adapter
1 x Micro USB Power Cable
1 x RCA Cable
1 x 3.5mm Aux Cable
1 xMultilingual instruction manual

(USB2.0 Bluetooth Adapter)
Features:
100% Brand new and high quality
Quantity: 1pcs
Bluetooth V2.0 + EDR
USB2.0 specification, backward compatible with USB1.1/1.2
USB bus powered, no power supply is built-in LED work light indication
Slim extremely light, built-in antenna, no USB connection, use, easy to carry
Frequency :2.400-2 .4835 Ghz
Usage Frequency: frequency hopping
Spread spectrum (FHSS)
Transfer Rate: 3Mbit / s (EDR), transmission speed more quickly
Security: 128 bits safe mode
Supports all Windows systems, including Windows, xp, vista, win7 win 8, etc
Support EDR security mode
Wireless transmission of documents, audio, video, wireless networking features such as wireless printing
Wireless connected devices (such as computer / PDA / mobile phones / printers / wireless game controller) with Bluetooth technology
Support VOIP voice calls seamlessly connect Skype software.
Bluetooth specification V 2.0 & V 1.2 Compliant
Supporting profiles : networking, Dial-up, Fax, LAN access , and Headset
Plug and Play, no driver
Length with only 1.9cm
Working with led lights
Weight: Approx 9g
Easy and Convenient to use

Package Include:
1 x USB2.0 Bluetooth Adapter