Features: - Works on any digital or analog cell phone, pager, wireless telephone, PDA, etc, as long as you have access to the battery compartment. In some cases, it may be applied to the back cover of a device, behind the battery (like in PDAs). - Boosts reception virtually anywhere - as long as there is at least ½ bar of antenna power. - Static is reduced - Easy to install - Each booster is individually packaged - No tools required for installation How does it fit? The Antenna Booster is easy to install. It comes with its own backing self-adhesive sticker. Just slip it underneath the phone's battery, and enjoy clear, enhanced, static-free reception. How does the Antenna work? The Internal Antenna Booster is a passive device designed to capture stray radiation in the body of the phone and re-radiate the signal to improve the phone's performance. The Antenna will work most efficiently when installed properly to reduce static (analog) and momentary cut-outs (digital) and increase clarity. Will the Internal Antenna help me get reception in dead zones? No. Despite what other resellers may claim. The Antenna Booster enhances a signal that's already in the area. It will not bring in a signal where there is none and cannot improve battery life. What models does it fit? It will fit all models except Nextel 500 & 800 series and any models with a screw-back battery compartment.