-integrated pir sensor -anti-tamper function -supports 99 radio sensors -timing sharp/blurred,sharp,input and output delay -the system via app,sms,call, remote control -you should know if you want a radio or wired system. usually we recommend radio system, because this is more easy to install. -you should know that a complete alarm system is not just a common alarm system, but also includes fire alarms (smoke detectors), panic detectors and environmental detectors. -please count the doors and windows in your house where burglars can enter. your alarm system should cover all inputs. -if you are a pet owner, we recommend that you use a friendly pir motion sensor to release your pet because the animals can trigger a false alarm. -decide if you need smoke detectors, gas detectors or wireless flash sirens to boost the alarm system.