Bluetooth Aux 3.5mm Adapter: Bluetooth receiver can be connected to non-Bluetooth car audio systems, stereos, speakers and wired headphones via the 3.5mm AUX adapter. And equipped with Bluetooth 5.0 chip for stable connection/fast transmission/wide signal range. Wide Compatibility: Bluetooth 5.0 receiver compatible with most smartphones, ideal for home audio systems or car. (such as: computer, TV, projector (transmit mode) / speakers, headphones (receive mode)). Amazing Sound Quality: Bluetooth Aux Receiver uses the latest suppression technologies noise reduction and digital signal processor (DSP) that can eliminate echo and block out distracting background noise so you get crystal clear call sounds. 4 Hours Battery Life: Time working time of this auxiliary Bluetooth receiver can reach 4 hours when you are on the phone or listening to music. It only takes 1.5 hours to fully charge the device with a USB fast charging cable (included). In addition, this Bluetooth music adapter can be used while charging, which is very convenient. Dual Connection: Portable car Bluetooth receiver can be paired with 2 devices at the same time. You can enjoy your music without worrying about missed calls. After pairing, the car radio automatically reconnects to your last paired Bluetooth devices.