World-1st 433MHz Signal Repeater Booster Extender to Wireless Range 200-500m for Home Security Alarm 433MHz Signal Repeater Booster Increase all your wireless alarm accessories range to 200 - 500 meters This product works with Wireless Burglar Alarm System, wireless GSM AutoDial SMS Alarm Security System (1.5M / 3.3M / 4.7M ) in 433Mhz Frequency supporting 2262 / 2240 / 1527 Chips The switch for choose the Shock resistance: Press No.1 mean transfer PT2262 1.2M signal. Press No.2 mean to transfer PT2262 1.5M signal.Press No.3 means to transfer Pt2262 3.3M signal.Press No.4 means to transfer Pt2262 4.7M