Install Easy and Fast: Plan how and where you are going to install and do a soft install first to test. The cell phone booster with all needed equipment included, read and follow the instructions, only takes about 20-30 minutes to install it all, can be done by anyone, simple, direct, and efficient. Note: The signal booster can only amplify but not create signal, if there is no signal outside, it won't work, please make sure you get at least 1 bars signal outside. FCC Approved and Professional Technical Support: FCC approved cell booster, designed with the high-quality components and repeated test for longevity and safety use, support 30 day money back, 3 year manufacturer warranty. GAGBK lifetime professional technical support, offer 24-hour friendly customer service, if any problems, please feel free to contact us, we will do our best for you, and if anything happens to any of the components, we will unconditionally replace those items for you. Stable Coverage for You: when you go out to the front porch or window only for a call, when you missed some important calls and always can not send or receive texts/pictures about your work, or when your stream videos that keep getting stuck, when these affect your life and work you definitely need this cell signal booster, such as some areas with poor cellular service: rural, country, mountainous area, remote regions, wooded area, metal house, polo, resort, secluded cabin, even some dead spots. Compact and Powerful: The cell phone signal boosters with automatic gain control(AGC) function, Max Gain 65dB, can detect the strength of the existing signal, adjusts itself for the best performance, eliminate self-oscillation to protect itself, then reflect real-time working condition through LED indicator. Sleep mode goes on standby to reduce power when the booster is not in use. Aluminum alloy material, makes compact size and better heat dissipation, effectively extend the life. Cell Phone Signal Boosters: Cell phone signal booster works with all U. S. Carriers; Verizon, AT&T, T-Mobile, Sprint, Straight Talk, Cricket, U. S. Cellular etc. Amplify GSM, 2G, 3G, 4G LTE, 5G signal on Band 2/4/5/12/13/17/25/66 from 1-2 bar to 4-5 bar up to 5500 sq ft, cellular signal booster provide clear calls and fast data transfer, it's a good partner for your work on rural, country, mountainous area, remote regions, wooded area, metal house, secluded cabin.