Compatible Modes: Suitable for iPhone, Galaxy and other smartphones, tablets, MP3 players, TF card, U disk and all Bluetooth devices. ^ Note: Please do not play music from two sources at the same time. If you want to change the mode from music to play, pause the music from the first source and then play the music from the other source. ^ Specification: Bluetooth Version: V3.0 + EDR Frequency range: 87.5-108.0MHz Supply voltage: 10-24V Operating current: 45mA Standby current: 25mA Power consumption: 1W Working temperature: 0-50 degrees Support file format: MP3/WMA/WAV Music format: MP3 Format USB Maximum support: 32G Micro SD Maximum support: 32G USB Charge output: 5V / 2.1A Transmit distance: 5m Audio input/output: 3.5mm audio connector Package content: 1 * Bluetooth FM transmitter 1 * 3.5mm audio cable (1m ) 1 * Instruction Manual^