Features: Support for Bluetooth /U disk: The usb disk is inserted and played immediately. The car radio frequency and Bluetooth MP3 frequency are adjusted to play the USB disk songs in a consistent manner. Safe and stable: Intelligent Bluetooth 5.0, a new generation of chip rapidly respond to constant temperature and steady current charging, no harm, make charging safer. Smart quick charge: 3.1a dual USB smart quick charge, dual USB interface charging at the same time, up to 3.1A, mobile phone and tablet charging at the same time. One-button answer: Bluetooth hands-free call, one-button operation, free driving. Double-click the button to make the most recent call in the call history. With memory function: Memory playback function when power is off, automatically return to the connection when starting up, memory frequency, track restart after power off from the first sentence of the disconnected song start to play. Navigation voice broadcast: Artificial intelligence is improved again, mobile phone navigation broadcast, one-button Bluetooth connection, more accurate voice broadcast. Strengthen protection: Firm and stable, strong shock and turbulence continuous charging, strengthen both sides of the anti-skid shrapnel, elastic and stable. Specifications: Material:ABS Color:Black Size(about):Screen:upper width:36mm/1.4inch;bottom width:24mm/0.9inch;length:47mm/1.9inch Charger total height:79mm/3.1inch Power supply voltage: 12-24 (V) Input current: 3.1a (dual USB intelligent current) Display screen: blue digital display Emission efficiency: 87.5-108mhz Effective distance: about 10.5 meters Bluetooth version: Bluetooth 5.0 Support expansion :U disk < 32G Launch range :< 5 meters Package Included: 1pc x Car Adapter Note: 1. Due to the light and screen difference, the items color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.