Customize your experience with TUNAI Connect App: TUNAI Connect App offers customized EQ setting for your maximum listening pleasure. You can also adjust other settings and upgrade to the latest firmware via App for the latest updates, making it the perfect car accessory for you. Eliminate all ground loop noise [feature upgrade from original version]: Firefly LDAC is packed with a ground loop isolator inside, eliminating common ground loop noise issues that plague most receivers, so you will no longer hear hissing and humming sounds when enjoying your music in the car. Simply switch on the function via the TUNAI Connect App. Automatically reconnect & Multi-device connectivity: Firefly LDAC remembers up to 8 paired devices so you can connect as soon as Bluetooth is switched on. It can also pair with 2 devices at the same time for easy music sharing. Authentic, HiFi quality music streaming via SONY LDAC codec and Cirrus Logic audiophile grade 127dB SNR DAC technology : Firefly LDAC supports streaming high-resolution audio over Bluetooth connections at up to 990 kbps (higher than aptX & aptX HD), making it the codec standard that delivers the highest quality wireless audio streaming for Android devices. Firefly LDAC also supports AAC, the most advanced codec for iPhone / iOS devices. Simple and effective: Transforms your home stereo and car audio sound systems into wireless and Bluetooth compatible speakers with just one, easy-to-use plug. No charging needed! Firefly LDAC automatically switches on when you start your engine or turn on your speaker.