Boost GSM 850mhz cell signal to make call and send txt??works with most US network providers</br>Coverage up to 2100sqft??supports 50 simultaneous users</br>Simple and easy to install</br>62dB Max. Gain??22dBm Output Power</br>Ship from our US warehouse?? but if out of stock?? ship from China by Express such as UPS DHL</br></br>Product Description</br></br>Technical Specification:<br/> Frequency Range:824-849MHz??869-894MHz<br/> Max. Output power:27dBm<br/> Max. Gain (dB) :62dB<br/> I/O Port : N-female on both ends<br/> 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.p