... 50ohm SMA Antenna interface, internalWireless Frequency:433.92MhzWorn Panic Button Transmission Dist:60meters in open air.Wireless Detectors Transmission ... Dist:100meters in open airAcceptable Max Worn Panic Button: 3Pcs(If not use 24Hours zones then is 6Pcs ... the model which support wireless sirenSkype: AsiaGSMalarm Big SOS Button GSM Elder Alarm System A11,Watchdog Alarm,24hours Alarm, ...