2, Indoor penholder antenna X1. 4,20 meters cable X1. 1, Intelligent to guide the installation with LCD 2, Detect the environment signal, And Real time display the signal strength.3, Automatic dormancy when no user make the calling 4, Automatic alarm when installation mistake and provide the according solution 5, Automatic adjust the system gain to avoid the repeater self-excitation 6, initiative reminding when the device was damaged. If you have any questions about our products, pls leave message to us, we will reply you as soon as possible. We apologize for the late reply during the weekend and holiday. The item "Cellphone signal booster 3g 4g 1900MHz 2200sq ft SMART LCD DISPLAY" is in sale since Tuesday, May 7, 2019. This item is in the category "Cell Phones & Accessories\Cell Phone Accessories\Signal Boosters". The seller is "sorakinc" and is located in Lexington, Massachusetts. This item can be shipped to United States.