Single User. Great for M2M applications. This dual-band (800/1900MHz) in-line booster works with major carriers that use CDMA, TDMA and GSM technologies on the 800/1900MHz frequencies. This product is primarily designed as an in-line booster for cellular modem, air cards and other M2M applications such as lotto machines, ATM's, monitoring equipment, as well as for boosting in vehicle cellular hands-free kits. Box Contents 1.CM2000-19dB dual band Amplifier 2.5" patch antenna with SMA-Male Connector 3.SMA-Female to FME-Male connector 4.RG58 Coax 5.110V AC power supply 6.User guide Simply connect the 2.5" patch antenna to the modem/air card, connect to the booster and then pick the outside antenna best suited for your application for best results.