zBoost YX520-i Dual-Band Cell Phone Signal Booster for Home and Office - 900 and 1800 MHz - White  International Increases your indoor mobile signal coverage &#8211; up to 200 sq. meters Eliminates most dropped or missed calls, easy to set up &#8211; comes complete with everything needed No cradle or connections to your phone Extends phone battery life (uses less power when signal is stronger) Works with most phones at 900 or 1800 MHz frequencies, protects the operator&#8217;s network using patent-pending technology