Premiertek Dual Band Cellular Signal Amplifier for Home and Office: * 850MHz/1900MHz * Greatly reduces dropped calls, extends signal range and increases data rates * No physical connection required * Allows multiple phones and cellular data cards to be used simultaneously * Oscillation (or interference) detection and automatic shutdown with auto reset * Overload protection circuit * Amplifies signals both to and from the cell tower * Automatic Level Control technology used to provide auto amplitude fixing * More than 20x the power of your cell phone alone * Works on all generations of CDMA, TDMA, GSM and 3G networks * Booster enables phone to work at reduced power