1, FM FM transmitter2, the light shows the window3, independent Bluetooth start / shutdown button4, line audio input5, support the use of U disk to play music6, support MP3 / WMA music format7, through the Bluetooth one-button hands-free, answer / hang up / refute / redial8, Bluetooth stereo music player, through the fm launch to the car audio.9, call echo cancellation and noise reduction (CVC) technology10, USB output voltage, can provide voltage to other devices up to 5V / 2.5A11, automatic stop frequency alarm function12, car battery voltage display Brand: Maikou Model: S7 Features: Fast forward (FF)/Fast rewind (REW) playing,with MP3 Connection: Bluetooth Interface: TF/Micro SD Card Slot,USB 2.0 Compatible with: MP3,Smartphones Material: Plastic,Electronic Components Color: Black,White,Gray Voltage: 12 - 24V Apply To Car Brand: Audi,BMW,Buick,Jeep,Toyota Built-in EQ: Classic,Pops Bluetooth Version: V4.0 Bluetooth protocol: HFP Transmit Distance: 10M Transmit Freq.: 2.4GHz Media Format: MP3 0.0450 Package weight: 0.07 kg Product size (L x W x H): 12.00 x 2.80 x 5.50 cm / 4.72 x 1.1 x 2.17 inches Package size (L x W x H): 13.00 x 3.00 x 6.00 cm / 5.12 x 1.18 x 2.36 inches Package Contents: 1 x Bluetooth FM Transmitter 1 x Audio Cable