Get a security alarm for your home or office. Security Installation Maintenance Monitoring Services (SIMMS) install security alarm systems across Perth and can arrange budget systems, advanced systems, monitoring, CCTV and security guards. Residential Security has never been as important as it is today but we are concerned also with it. The company also offers to you a wide range of home alarm packages to protect your property. SIMMS evolved from performing contract work to larger companies in Perth.