Used open box cell phone signal booster kits are pre-owned returned units with an opened box discount price. Unlike refurbished cell phone signal boosters that come with 1 yr. manufacturers warranty, these come with 60 days total satisfaction guarantee for your assurance. Do they work the same as new? We make sure they do. We test each one of them to ensure they perform per manufacturers specifications before listing them for sale as open box used cell phone signal boosters. Therefore, they should work perfectly well just like their brand new cellular amplifier conterparts. Furthermore, they save you money simply because in many cases they have been opened by customer to perform soft installation but they chose to install another mobile repeater model which was more suitable for their vehicle, home, office, or building. A true win-win situation.