Product Introduction of mobile phone signal amplifier： The product can be used in mountain areas, urban areas, towns, villages in the city, underground warehouse, basement, underground parking lot without signal area. The function is to draw (absorb)he stable signals outside to the room and then amplify and diffuse the signals to cover the whole effective area, so as to provide stable and high-quality signals to the equipment in need of signals.

Before buying please note!
1. Make sure the frequency band of your carrier is suitable for this item. Otherwise the device can't work for you. If you do not so clear the frequency of your phone, you would click this link www.frequencycheck.com for check the frequency band of your carriers.
2. Make sure you can receive good signal that you want to amplify on your house outside. Which must be can getting 3~5 bar signal (-70dB~90dB signal strength) on your mobile phone. Please note that the signal booster can only boost the mobile phone network signal, but it does not help to generate any signal. For example, if your outside signal has 0 bar, it can't work or bring you any signal. Below is the method of check the mobile phone signal strength.