Welcome to the shop! This extremely portable and lightweight wireless audio transmitter and receiver is an ideal wireless audio solution for a variety of situations and uses. Transmitter mode: Wirelessly streams audio from your non-Bluetooth TV, home stereo system, or CD player to your Bluetooth headphones or speakers. Receiver mode: Wirelessly streams audio from your Bluetooth-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones. Switch between transmitter and receiver modes with a simple button press. Easily connect using advanced Bluetooth technology and a 3.5mm audio cable (included). Super portable audio streaming power. The KN319 is only 44mm (1.73') in diameter and weighs only 18g (0.63 oz), yet boasts powerful wireless audio streaming capabilities. Slip this transmitter and receiver into your backpack or laptop bag and take it with you effortlessly. Your satisfaction is our top priority. We will provide you with the best service. If you encounter any problems after receiving the product, such as damage, incorrect quantity, etc., please contact us immediately and we will provide you with the best solution!