Work with 850mhz 1900mhz cell signal??if you are not sure your cell signal frequency?? please contact us. We would help you to choose a correct Signal booster.</br>Large coverage?? up to 3000sqft?? good for home or office?? no more dropped call again.</br>Easy to set up?? ship by retail packaging via Express shipping??3-5 working days delivery.</br>Guarantee: 30-day money-back guarantee?? 3 months free replacement??3 year manufacturer warranty.</br>Note: need to place the indoor antenna facing away from the outdoor antenna?? to avoid interference.</br></br>Product Description</br></br>Technical Specification:<br/> 1. Frequency Range: 824-849MHz??869-894MHz??1850-1910MHz??1930-1990MHz<br/> 2. Max. Output power: 27dBm<br/> 3. Max. Gain (dB) : 65dB<b