B9 Smart Digital Display Dual USB Bluetooth Car Charger with Hands-free Call Function 1. Smart fast charging, support dual USB charging at the same time 2. Support Bluetooth musicTF cardU disk playback, support Bluetooth hands-free communication 3. LED screen, can display frequency, voltage display 4. Reinforced anti-slip pad design, the car charger fits closely with the cigarette hole, and the shockproof effect is good 5. Material: ABS+PC, electronic components 6. Product features: one-button hands-free calling, Bluetooth music playback, dual USB 3A charging, TF cardU disk music playback, FM FM transmission 7.Using voltage: DC12-24V 8. Output current: 3A 9. Bluetooth version: 5.0 10.FM frequency: 87.5-108MHz 11. Audio format: MP3WAM 12. Signal to noise ratio: 85db (FM: 65db) 13. Bluetooth distance: 5 meters 14.FM transmission distance: 5 meters 15. Dimensions: 8 x 4.5 x 1.5 cm 16. Product net weight: 40 grams