| Business | Phone |
| Bay Alarm Co Redwood City 94063 | (650) 361-1314 |
| First Alarm Security Group Redwood City 94063 | (650) 556-1111 |
| Norcal Alarm Redwood City 94063 | (650) 363-1636 |
| Peninsula Security Svc 1755 E Bayshore Rd # 28b, Redwood City 94063 | (650) 369-7100 |
| Qualys Inc 1600 Bridge Pkwy, Redwood City 94065 | (650) 801-6100 |