This is a special multifunctional BT LCD transmitter, which is applicable to all kinds of vehicles. It can be used as a charger, a car voice broadcast navigation, a stereo music player and so on. With Standard 5V/3.4A current, it is widely applicable to most mobile phones and different digital products.   Features: Adopt Call Echo cancellation and noise suppression (CVC) technology.  Support answer, hang up, reject and redial via BT.  Support BT stereo music to play and audio output.  Support car accumulator voltage detection.  Support micro SD card (1G-32G) and MP3 and WMA format.  Auto power-off memory function.  Support charging for mobile phone; the maximum output is up to 5V/3.4A.  USB1 supports playing music from U disk and charging mobile phones.  USB2 supports automatic charging identification and charging mobile phones.  Support BT auto re-connection when power on.  Support voice broadcast of navigation and calling incoming.   Specifications: Rated working voltage: 12V-24V;  Limit working voltage: 9V-26V;  USB1: music playing from U disk; charging output 5V/1A;  USB2 output: 5V/2.4A;  Working temperature: 0-60°C;  Play format: MP3, WMA;  Battery voltage display accuracy: error±1V;  SNR: >60dB;  Degree of distortion: 60dB;  BT version: version 4.2+EDR;  BT sound processing: A2DP (Advance Audio Distribution Profile) function supported;  BT transmission distance: barrier-free within 10m;  Effective distance of BT microphone: 0.5-1.5m;  FM frequency: 87.5-108.0MHz;  Launch effective distance: <2m;  Item size: 21 * 4.6 * 4.6cm / 8.27 * 1.81 * 1.81in;  Item weight: 90g / 3.17oz;  Package size: 17 * 11.1 * 5.2cm / 6.69 * 4.37 * 2.05in;  Package weight: 160g / 5.64oz;   Package List: 1 * BT LCD Transmitter;  1 * Audio Cable;  1 * User Manual Manual