10,000 sf coverage area: The YX610-Dual band wireless repeater is a Bi-Directional Amplifier (BDA), designed for single or multiple cell phone users in homes or offices up to a maximum 10,000 square foot area when unobstructed. Dual-Band design covers all phones except Nextel iDen types, and provides a visual indicator if the antenna is positioned improperly, but will NOT suffer damage or interfere with the Carrier Network. YX610 YX-610 YX 610 Multiple Cell Phone Repeater Antenna, Wi-Ex DualBand ProPack - YX610PCSCEL