| Business | Phone |
| Centec Security Systems Inc W228n727 Westmound Dr, Waukesha 53186 | (262) 549-6000 |
| Toepfer Security Corp 2215 Corporate Dr, Waukesha 53189 | (262) 650-7233 |
| Security Equipment Supply 2325 W Bluemound Rd B, Waukesha 53186 | (262) 717-0296 |
| Entrance Systems Po Box 893, Waukesha 53187 | (262) 662-3939 |
| Hsm Electronic Protection Svc W226n665 Eastmound Dr, Waukesha 53186 | (262) 521-3900 |