PROUTONE 3G Cell Phone Signal Booster for Car/Truck/RV Use- Dual Band 850/1900MHz Repeater Kit Work with All Carriers - Improve Traveling Signal COMPATIBLITY: The car signal repeater supports 2g 3g for Verizon, AT&T, T-Mobile,Sprint and more on Band 2/5, work with particular carriers on 4g. Improve Voice Signal: Reduces dropped & missed calls, better voice quality and 3g data signal in Car, Truck and RV. Automatic Gain Control: When outside signal is too strong or self-oscillation that the booster can automatically adjust gain to give you the best suitable signal, better protection for booster. EASY TO INSTALL: All of the components for installation and the step-by-step instructions are included in the package, Requires no technical experience or extra fee. GUARANTEE: 30 Days Customers Satisfaction,3 Months Free Replacement, 5 Year Manufacturer Warranty. Professional Technical Support.