[Upgraded 5.4 Bluetooth Technology] - Syncwire aux Bluetooth 5.4 adapter for cars uses the latest Bluetooth 5.4 chip, aiming to provide faster transmission speed, higher reliability, stability, and lower latency; offering clear calls, stable audio and signal transmission. Elevate your driving experience with reliable audio streaming and seamless connectivity. | [Plug-and-Play Convenience] - The Bluetooth receiver adapter can easily be used with car audio systems, home audio speakers, and amplifiers. Simply power it and plug it into the 3.5mm port by the 3.5mm connector or the cable to use, and you can easily connect these devices to mobile phones, tablets, etc. Note: This is an aux Bluetooth receiver, it cannot be paired with Bluetooth headphones/speakers. | [Dual-mic for Clear Hands-Free Call] - The Bluetooth aux adapter solves the inconvenience of making a call and the problem of unclear call sound while driving. With a simple press, engage in hands-free conversations with dual microphones capturing every word. Drive safely while enjoying clear communication. | [22 Hours Superior Battery Life] - The aux adapter is designed with a battery life of up to 22 hours, indulging in non-stop calls and music. Quick recharge with the included Type-C cable means it is ready to use anytime anywhere. | [Deep Bass & HiFi Stereo Audio] - Just press the "b" button on the side to enjoy powerful deep bass and immersive stereo sound. At the same time, it also uses high-quality HiFi technology to restore the real sound and powerful bass, providing the ultimate listening experience. | [Colorful Light Switch] The colorful LED lights provide visibility in the dark. However, it can easily be switched off with a long press according to your needs. Easy to use with no distractions to the driving.