The WilsonPro 859969 5-Volt/2-Amp AC/DC Building Signal Booster Power Supply is designed to provide AC power for the WilsonPro Signal 3G. This power supply has a mini USB jack and plugs into a standard wall outlet. It converts from a 120 volts AC to 5 volts DC. . Mini USB jack . Works with Signal 3G . 3-year warranty from date of purchase