UPGRADED BT5.0 & STEADY CONNECTION: Our Bluetooth car adapter uses the latest Bluetooth 5.0 technology, provides a faster and stable connection to the devices within a 33ft operation range. A built-in high-definition microphone, allows you to enjoy high-quality sound quality in all calls. SAFETY HANDS-FREE CALLING & INTELLIGENT MEMORY: Built-in microphone can set free your hands during answer the calls and let you safely and conveniently drive. After the first connection is successful, the wireless car Bluetooth adapter can be paired automatically. PORTABLE MINI DESIGN & 3.5MM AUX ADAPTER: Lightweight and compact mini design makes it space-saving and could easily take with you while traveling. Simply plug the 3.5mm auxiliary adapter into the AUX input of the old audio device and pair it with your Bluetooth device, can easily enjoy favorite music or hands-free calls. WIDE COMPATIBILITY & LONG BATTERY LIFE: Compatible with most Bluetooth-enabled devices, it's the best ideal for home or vehicle audio systems and wired headphones. This Bluetooth audio adapter works up to 7 hours and takes only 1.5 hours to fully charge the device. In addition, our Bluetooth adapter can be used during charging. ENJOY WIRELESS LIFE: This Bluetooth aux receiver enables you to convert your old home wired speakers or headphones into wireless, enjoy streaming music.(GUARANTEE: If for any reason you are not 100% satisfied with the Bluetooth receiver, please let us know and we will solve the problem for you immediately)