Notice: The antenna works for Huawei Router， can improve phone/computer wifi signal， can not improve 4G/3H/2G signal. Thanks! Feature:4G/3G/2.4G Antenna.Dual SMA Connectors.Gain: 38dBi.Be used for Latest Devices with Dual SMA Ports (Frequency: 690~2700 MHZ). Fit HUAWEI B593 B880 E5172 E5175 E5186 B890 / ZTE MF253 MF283 MF25D MF28G MF28D Router Mobile Broadband (Huawei E5186， Huawei B890， Huawei B593U-12， Huawei B593S-22， Huawei B593U-91， Huawei B593U-12， Huawei B593U， Vodafone B4000， Vodafone B3000， Vodafone B2000， Vodafone B1000， Huawei E5172AS-22， Huawei E5172S-22， Huawei E5172， ZTE MF28G， ZTE MF29T， ZTE MF29S2， ZTE MF28D， etc ) Specification:VSWR:��1.5Gain:38dBiPolarization Type: VerticalMaximum Input Power:50WInput Impedance:50 OhmsConnector Type: SMACable length: 2.9mSize: 21.5 x 8.5cm (H*W)Weight:170g Package Content:1 x Antenna(would be sent safely in bubble bag)