Signalbox 55dB 900/2100MHz GSM/3G/WCDMA/UMTS Cell Phone Signal Booster Repeater for Car Use Frequency Range : 890--915MHz /1920--1980MHz, 935--960MHz /2110--2170MHz Standard Supported : GSM, WCDMA, UMTS, 3G etc. Max. Gain (dB) : 55dB I/O Port : N-female on both ends Power Supply : Input AC 90-260V, Output DC 12V/ 2.5A