Boost GSM W-CDMA 850mhz cell signal to make call and send txt??works with most US network providers.</br>Coverage up to 2100sqft??supports 50 simultaneous users??No more dropped calls.</br>Simple and easy to install?? easy-to-open packaging??ship from US warehouse or China by UPS DHL EMS</br>Installation Points: facing the closest cell tower?? need to place the indoor antenna facing away from the yagi antenna</br>Guarantee: 30-day money-back guarantee??Three months Free Replacement??1 Years Manufacturer Warranty</br></br>Product Description</br></br>Technical Specification:<br/> 1. Frequency Range:824-849MHz??869-894MHz<br/> 2. Max. Output power:22dBm<br/> 3. Max. Gain (dB) :62dB<br/> 4. I/O Port : N-female on both ends<br/> 5. Power Supply :Input AC100~240V 50/60Hz??output DC 5V 2A<br/><br/> Note:<br/> 1. This booster work for GSM W-CDMA 850mhz in US. There is a website of signal carrier's frequency for your reference: <b>http://www.unlockonline.com/mobilenetworks.php</b><br/> 2.before purchase?? please make sure you