We offer the newest version siren host from Aug,2020;different from old one is setup guide,PLEASE NOTE an important tips:have to trigger the sensors within 6 seconds during the operation,or need pug in/out again into setting status.DOOR ALARM uses remote control to set security code for arming/disarming;home alarm system complete with fully programmable main unit and sensors,if you want to DIY,please restore factory as manual or operation video,then add them again. | DIY expandable home burglar security alarm system-this alarm horn support up to 30 pcs wireless detectors,8 remote keyfobs,loud up to 115db deluxe door alarm system for peace of mind. | Complete DIY wireless house burglar alarm system kits includes a horn and three window/door sensors,two remote controls,two pir motion detectors, loud alarming to protect well for apartment shed hotel garage RV motor home safety ,affordable home security. | Loud SOS alarm and easy to get help-children and seniors at home in emergency,press the S button of the remote controller,which will trigger the siren alarm up to 115db to notice neighbors or other families in home so that they will get help in time. | After sale service- Kindly refer the user manual before usage,if you have any issues or need to customize alarm system kit,please feel free to contact us in our shop,we will try our best to help you out soon;the alarm system kit can compatible with KERUI brand another type alarm hub,DIY complete alarm system as your need.