1. This extremely portable and lightweight wireless audio transmitter and receiver is an ideal wireless audio solution for every situation and application 2. Transmitter Mode: Wirelessly stream audio from a non-Bluetooth TV, stereo or CD player to a Bluetooth headset or speaker 3. Receiver Mode: Wirelessly stream audio from a Bluetooth-enabled phone, tablet, or computer to a wired stereo, speakers, or headphones 4. Switch between transmitter and receiver modes with the flick of a switch. Closes easily with advanced Bluetooth technology and 3.5mm audio cable (included). 5. Ultra-portable audio streaming capability: The KN319 is only 44 mm (1.73 inches) wide and weighs only 18 grams (0.63 oz), yet it has powerful wireless audio streaming capabilities. Put this transmitter and receiver in a backpack or laptop bag and take it with you.