Feature: Dual USB (Universal Serial Bus) 3.4A fast charge, battery voltage detection. Support bluetooth music / TF card / U disk player, bluetooth hands-free calling.LED screen, can display frequency, song number & working status information. Support folder switching play function, song classification play. Support power & memory function.2 mobile phones charge at the same time, support charging while listening to songs. Noise cancellation function, built-in noise cancellation circuit, make the call sound clearer. Specification: Model BT-16 Display LED display USB Type Dual USBInput voltage 12-24 V Format MP3/ FLAC/ WAV/ WMAEffective distance 5MSupport DV12-24 V Output voltage DC5V 3.4 A Frequency range 87.5~108 M Hz Phone IOS, Android Micro SD card/ USB (Universal Serial Bus) disk 32 G Package Included:1 XBT16 Car bluetooth FM Transmitter Manual:https://mega.nz/!az 5z S Ay A! Gm 4LPOn W_c T Ul_TDk F Zvjx Lp 8YZ-Xh Nn Nz W6el 6 Ea O4