Increase your cell phone signal by up to 25 times in your car, RV or boat * Plug & Play Kit--easy installation; everything your need is in the box * Improve cellular signal and data rates for multiple phones and data cards * Works with 800/1,900 MHz frequencies for all US and Canadian carriers (except iDen/Nextel/MIKE) * It has 30-day money-back guarantee and a 1-year manufacturer"s warranty