Four play modes with color screen - Bluetooth play, TF Card play, U Disk Play, AUX Play - Noise and wind suppression by CVC technology to create full duplex sound quality - Supports MP3/WMA/WAV/FLAC; anti-static design; enjoy lossless music in your car More features - Supports incoming call announcement; fast forward and backward - Supports hands-free calls and private calls - Built-in protection: over-current protection, over-voltage protection, intelligent temperature control, and short circuit protection Safety function - Volt meter monitors the car battery constantly - Battery voltage ranges: 14.8V to 13.4V is high when the car is on and moving - 12.8V to 12.2V is normal when the car is parked and ignition is off - Below 12V, charge as soon as possible High sound quality and hands-free calling - CVC technology reduces noise and wind to deliver clear full-duplex sound - Built-in microphone - Wireless Bluetooth FM transmitter with hands-free calling; answer calls with one click and stay safe while driving Practical use scenarios - Daily commute: pair via Bluetooth to stream music from your phone and take hands-free calls without distraction - Road trips: use TF Card or U Disk to play curated playlists or audiobooks for long drives - Car parked or engine off: monitor battery status with the voltmeter to prevent unexpected drainage and know when to recharge