The Wi-Ex zBoost zP is a cell phone signal extender. It is designed for personal use, and will repeat and amplify a cell phone signal to a coverage area of 4 to 6 feet from the boosting antenna. It is compatible with most GSM and CDMA network phones, but is not compatible with Nextel. There are only three components included with the zBoost zP: 1) the base unit, 2) the booster antenna, and 3) the power cord. Installation is simple: Place the base unit near (or suction) to a window, connect the power, then connect and place the antenna near to your desired coverage area. The cord connecting the antenna is about 19 ft. long, so you have more flexibility on where you want to get your 4 - 6 ft personal cell area. There are two zBoost zP models: 1) the wireless YX300 retails for $169 and is currently available, and 2) the wired YX100 will retail for $100 but is not yet available. The Wi-Ex zBoost YX510 is a more expensive alternative with a much broader coverage area of 2500 sq. ft., retailing for $399.