SF03R Smart Magnetic Sensor Remote Control Wireless Door Window Alarm Security alarm for wireless burglar and door, with remote control function, can install home security.Many burglaries occur through doors / windows, especially side doors, back doors and garage doors.This alarm with a 105 dB loud alarm can help prevent intruders, wake you up or remind you and possibly warn your neighbors.There are four modes of wireless home alarm - - arm / evacuation / panic / doorbell mode controlled by remote control, wireless control range up to 49 feet.Here is 24-hour E-mail service, we're always willing to listen to your concerns! So if you have any problem, please do not hesitate for a moment to contact us. We will surely give you a satisfactory reply.