Intuitive and customized experience: It can't be easier to use Firefly Chat LDAC - it simply powers on when you plug in the USB on your car or speakers and connects right away to your phone (once you’ve paired it with Bluetooth). Plus, tailor your listening experience by downloading TUNAI Connect App - you can now easily adjust the EQ setting for your listening preference. Upgrades to the latest firmware via App are also available on the app! | Authentic and Hi-Fi quality sound experience via LDAC codec and Cirrus Logic audiophile grade 127dB SNR DAC technology: Firefly chat LDAC supports LDAC for Android devices , delivering the highest quality in Bluetooth audio (24-bit/96kHz and 990kbps transmission rate). Firefly Chat LDAC also supports AAC, the most advanced Bluetooth audio technology for Apple iPhone and other iOS devices. | Automatically reconnect & multiple device connectivity: Once the engine starts, Firefly Chat LDAC automatically connects to the last paired smartphone, just like your car's built-in Bluetooth (plus you never have to charge it either!) It can also pair with 2 devices simultaneously for easy music sharing. | No more ground loop noise [feature upgrade from original version]: Say goodbye to the annoying hissing and humming sounds when enjoying music streaming in the car. A ground loop isolator (worth $10+) is packed inside the compact Firefly Chat LDAC to remove potential ground loop noise issues that plague most receivers. (Note: to turn the feature via TUNAI Connect app) | Safe Hands-free Calling: Firefly Chat LDAC has a built-in microphone for making phone calls safely while driving. Just press the button to take an incoming call. If you prefer not to have the call function, check out TUNAI Firefly LDAC Bluetooth Adapter.