Features 1、This extremely portable, lightweight wireless audio transmitter & receiver is an ideal wireless audio solution for a wide range of situations and uses. 2、Transmitter mode, wireless audio from your non-BT TV, home stereo system, or CD player to your BT headphones or speakers. 3、Receiver mode, wireless audio from your BT-enabled phone, tablet, or computer to your wired stereo, speakers, or headphones. 4、Switch between transmitter and receiver modes with the simple flick of a switch. Effortlessly connect using advanced BT technology and 3.5mm audio cable. 5、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. Specification Features: This extremely portable, lightweight wireless audio transmitter & receiver is an ideal wireless audio solution for a wide range of situations and uses. Transmitter mode, wireless audio from your non-BT TV, home stereo system, or CD player to your BT headphones or speakers. Receiver mode, wireless audio from your BT-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 BT technology and 3.5mm audio cable. 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: Material: ABS Size: Approx. 4.4*4.4*1.2cm/1.73*1.73*0.47inch Model: KN319 Technologies: BT4.2, A2DP, AVRCP (receiver mode only) Operation Range: Up to 10m/33ft (without any blocking objects) Charging Time: 2 hours Continuous Use Time: 6 hours (Receiver Mode)/5 hours (Transmitter Mode) Battery Type: Li-Polymer (200mAh) Package list: 1 x Adapter 1 x Micro USB Charging Cable 1 x RCA Cable 1 x 3.5mm AUX Cable 1 x Instructions