Item Details: new and high quality *This extremely portable, lightweight wireless audio transmitter & receiver is an ideal wireless audio solution for a wide range 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 the simple flick of a switch. Effortlessly connect using advanced Bluetooth technology and 3.5mm audio cable (included). *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. *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: KN321 *Technologies: BT5.0, A2DP, AVRCP (receiver mode only) *Operation Range: Up to 10m / 33ft (without any blocking objects) *Charging Time: 2 hours *Continuous Use Time: 4 hours (Receiver Mode) / 3 hours (Transmitter Mode) *Battery Type: Li-Polymer (200mAh) *Dimensions: 44 44 12mm *Weight: Package Contents: 1*Bluetooth Audio Transmitter/Receiver Adapter 1*Micro USB Power Cable 1*RCA Cable 1*3.5mm Aux Cable 1*User Manual size93mm*103mm*23mm Notes: The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.