Specifications:It supports mobile phone navigation voice prompts and supports activation of mobile phone voice assistants.This player also has bluetooth-compatible hands-free answering, hanging up, rejecting, redialing and other functions.Built-in rechargeable battery, it can work continuously for 20 hours.One-button operation make it more convenient and easy to use.You can connect two mobile phones at the same time with fast and stable connection.Smart sensing design enables it to automatically connect to the last paired mobile phone.Item Name: Car MP3 PlayerMaterial: ABSBluetooth Standard: V5.0+EDRBluetooth Frequency: ISM2.4GHz-2.48GHzBluetooth Working Range: 0-10MBuilt-in Rechargeable Battery: 3.7V 500mAh(Included)Charging Time: 2-4 HoursWorking Time: Up to 20 HoursStandby Time: Up to 100 HoursFeatures: Hands-Free Calling, One-Button Operation, Stable ConnectionSize: 14cm x 5cm x 2cm/5.51" x 1.97" x 0.79" (Approx.)Notes:Due to the light and screen setting difference, the item& 39;s color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Car MP3 Player1 x User Manual