This extremely portable, lightweight wireless audio transmitter and receiver is the ideal wireless audio solution for every situation and uses transmitter mode: to transfer audio from non-Bluetooth TVs, home Stereo system or CD player wirelessly to your bluetooth headphones or speakersReceiver Mode: Wirelessly stream audio from a Bluetooth-enabled phone, tablet or computer to a wired stereo, speakers or headphones Switch between transmitter and receiver modes with the flick of a switch. Connect easily with advanced Bluetooth technology and 3.5mm audio cable (included).The ultra-portable audio streaming power supply 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. Slide this transmitter and receiver into your backpack or laptop bag and take it with you effortlessly.Wide Compatibility: With the included 3.5mm cable and 3.5mm to 2RCA cable, this receiver transmitter adapter can be widely used in your computer, laptop, home stereo, headphones, smartphone, Mp3 Players, CD players, etc.Specifications: Model: KN319 Technology: BT4.2, A2DP, AVRCP (Receiver Mode only) Operating Range: Up to 10m / 33ft (without any obstructions) Charging Time: 2 Hours Continuous Use Time: 6 Hours ( Receiver mode) / 5 hours (transmitter mode) )Battery Type: Lithium Polymer (200mAh) Dimensions: 44 44 12mm Weight: 18g Package Contents: 1 x Bluetooth Audio Transmitter/Receiver Adapter 1 x Micro USB Power Cable 1 x RCA Cable 1 x 3.5mm Auxiliary Cable 1 x User Manual