This ultra-portable and lightweight wireless audio transmitter and receiver is the ideal wireless audio solution for every situation. Transmitter Mode: Wirelessly stream audio from non-Bluetooth TVs, home stereo systems, or CD players to your Bluetooth headphones or speakers. Receiver Mode: Wirelessly stream audio from a Bluetooth-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones. Switch between transmitter and receiver modes with the touch of a button. Easily connect with advanced Bluetooth technology and a 3.5mm audio cable (included). This compact audio streaming device is only 44mm (1.73 inches) wide and weighs just 18 grams (0.63 oz), yet it delivers powerful wireless audio streaming capabilities. Slip it 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 with your computer, laptop, home stereo, headphones, smartphone, MP3 player, CD player, etc. Specifications: Model: KN319 Technology: BT4.2, A2DP, AVRCP (receiver mode only) Operating Range: Up to 10m / 33ft (without obstacles) Charging Time: 2 hours Continuous Use Time: 6 hours (receiver mode) / 5 hours (transmitter mode) Battery Type: Lithium Polymer (200mAh) Dimensions: 44 x 44 x 12 mm Weight: 18 g 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