-Callboost 33dBm high power signal booster easy to cover over 1000-3000m2 and easy to install. -ALC function,auto control of output power for stable coverage. -LCDdisplay of system operating status such as frequency,gain,output power and isolation. -ISO display and alarm function make installation and debugging easy. -Able to increase signal coverage,decrease mobile phone radiation, and increase mobile phone battery lifespan.