Please note, this item ships from an international seller. Expected delivery is 10-15 days. Product Description Size: 5 * 3.5 * 8cm Features: 1: support Bluetooth music / TF card / U disk playback, support Bluetooth hands-free calling 2: Support USB port charging current 5V-2.1A 3: LED screen, can display frequency 4: Support power-off memory function 5: Precise structural design, piano paint appearance 6: Support memory card U disk playback 7: answer / hang up, press the answer key once 8: Double-click the button to call back 9: Power-off memory playback function: Automatically connect back after power-on, memorize frequency, restart the track after power off, and start playback from the first sentence of the song 10: Support power and storage functions 11: Support charging when listening to songs 12: Noise canceling function, built-in noise canceling circuit, make the call sound clearer Instructions: Step 1: Start the car, plug in the car Bluetooth MP3 Step 2 Turn on the Bluetooth of the mobile phone and search for ?BT-CAR? cigarette lighter jack for matching connection. The third step press + / two keys to adjust to the FM used in the car Step 4 If you need to adjust the playback frequency, please press the "CH" key to make the channel consistent, and you can switch it for the first time. Bluetooth version: V3.0 Interface: Hi-Speed ??USB2.0 Screen: LED screen Support U disk capacity ?16GB Support TF card capacity ?32GB Power supply: DC12V-24V Supported file types: MP3 Working current: 45mA DC12V Bit rate: 64-320 kbps FM frequency range: 87.5-108MHz (100KHz step) Signal to noise ratio: 85db (FM: 65db) Harmonic distortion: