Description: Support hands-free calling, built-in microphone, convenient and secure answering phone. Noise handling during call CVC, wind noise suppression, full-duplex call technology. Directly play high-quality mobile phone after connecting to Music. Automatically connect back after power-on, automatically enter the pairing state. Support TF card expansion to play MP3/WAV format music. Comes with car charger, output 5V-1000m, can charge handheld terminal device. Support TF Card (32GB, 16GB, high speed 6 or more) . Specification: version: V2.1+EDR Frequency: 20h-20khz Sensitivity: 42dB +3db360 Voltage: 5V+-0.5 Operating current: 45mA Standby current: 25mA Frequency: 2.402-2.480ghz Effective distance: 5 meters Sensitivity: -92dbm RF output: 4dbm FM FM: 87.5MHZ-108.0MHZ Transmit power: 87dbuv/107dbuv Effective distance: 2 meters Package Includes: 1 Piece Car FM Transmitter 1 Piece Manual Note: Please allow 0.5-1inch measuring deviation due to manual measurement(1cm=0.39inch） Due to the different monitor and light, the actual colors of the item might be slightly different from the color showed on the pictures. Your satisfaction is our utmost concern. Thank you!