The cell phone booster att signal booster works for All American Users. The att cell phone antenna booster kit can solve the cellular Poor Cell Reception Problem. Signal Booster 4G LTE Cell Phone Booster The Signal Repeater Call support 2G / 3G / 4G,the network can only support 2GFeatures: GSM 900MHZ booster. Made of alloy material, very durable for use. 50-200 square meters suitable. Enlarging the coverage area of the base station signal. Improve the coverage of sending and receiving mobile phone signals. Great tools to boost the signal of your smartphones. It is easy to install and use. Specifications: -Frequency range: -Uplink: 890-915 - MHz -Downlink: 930-960 MHz -Boost gain (dB): Gp > 58 Gp > 55 -Outdoor directional antenna gain (dB): 8 -Indoor antenna gain (dB): 3 -Major exporters (PO) more than 10 dBm -Pass band ripple less than 3 dB -The noise index is less than 4 dB -Transmission delay s < 0.5 -Ambient temperature -10 C - 60 C -Power AC110 - 220V45 - 55Hz -Reliability reached gb6993 - 86 standard -ETS300694-4 standard EMC -Size: 140*100*20mm/5.51*3.94*0.79in -Packing size： 480*200*150mm/18.90*7.87*5.91in -Outer antenna length: 10 meters Package Included: 1 x GSM 900Mhz Repeater 1 x Outdoor Aerial 2x Indoor Aerial 1 x Charger 1 x User Manual 850MHz CDMA Cell Phone Booster for 3G/4G Verizon Cell Phone Signal Repeater Cell Phone Signal Booster The Signal Repeater Call Support 2G / 3G / 4G Cell Phone Signal Booster Mobile Signal Booster 800/1900MHz Cell Phone Booster 850/1900MHz 75dB 3/4G LTE Amplifier Signal Booster Add to Cart Buying Options Buying Options Buying Options Customer Reviews 3.0 out of 5 stars 1 — — — Price $63.00$63.00 — no data — no data — no data Signal Booster 3/4G 2/3/4G 2/3/4G 3/4G