: This extremely portable and lightweight wireless audio transmitter and receiver is the ideal wireless audio solution for all situations and using transmitter mode to: Stream audio from a non-Bluetooth TV, home stereo system or wireless CD player Bluetooth headset or receiver mode speaker: stream wireless audio from Bluetooth phone, desktop computer stereo, speaker or wired motion toggling between transmitter and receiver mode with switch. Easy connection using advanced Bluetooth technology and 3.5mm audio cable (included).KN319 ultra-portable audio streaming power is only 44mm wide and weighs only 18g (0.63oz), but offers powerful wireless audio streaming. Slide the transmitter and receiver into your backpack or handbag and carry them effortlessly. Compatibility range: Included cables from 3.5mm and 3.5mm to 2RCA cable, this receiver - transmitter adapter can be widely used in your computer, laptop, home stereo, headphones, smartphones, MP3 player, CD player, etc..2 hours continuous use: 6 hours (receiver mode) / 5 hours (transmitter mode)) Battery type: Li-polymer (200mAh) Size: 444412mm Weight: 18g Package contents: 1x Bluetooth audio transmitter/ Receiver adapter 1x micro USB power cable 1xRCA cable 1x3.5mm auxiliary cable 1x User manual