ER1727B Features Allows you to listen to music and enjoy hands-free conversation with wireless earphones Supports a TF card and MP3 file format Built-in FM transmitter Adopts 2.4G third generation CSR Bluetooth and up to 8 meter transmitting distance Built-in a microphone and rechargeable battery HD LCD display screen to display frequency and incoming call Automatically plays music from a TF card Can remember the song name， frequency and volume when powered off Adopts digital transmitter technology to eliminate outside noise General Specs Brand & Model XN-168D Type Bluetooth speakerphone & MP3 player Color Black Bluetooth Profile AD2P Bluetooth Version BlueCore3 Transmitting Frequency 87.5-108.0MHz Transmitting Distance 8 meters Display  LCD display Voltage 12-24v File Format Supported MP3 Package Details Weight: 261.08 g Size: 19.5*15*5.2 cm Package Includes * XN-168D Multifunctional Steering Wheel Bluetooth Hands-free Car Speakerphone & MP3 Player