Why response time matters more than alarm count

We get the request once or twice a month. A property manager has been quoted by a competitor for 24 alarm sensors; we have quoted 12. "Are you cutting corners?" The honest answer is no — we are cutting noise. More sensors do not make you safer. Faster, more accountable response does. Here is the math.

The detection-to-resolution timeline

When an intrusion happens, six things must happen in sequence before the threat is neutralised:

1. The sensor detects the event (1 to 3 seconds).
2. The signal reaches the monitoring centre (2 to 8 seconds, longer if cellular signalling is the only path).
3. An operator triages — false alarm or real (15 to 90 seconds).
4. Dispatch decision is made and a response unit is sent (10 to 30 seconds).
5. The response unit arrives on site (3 to 25 minutes, depending on geography and traffic).
6. The unit enters the premises and resolves the incident.

Steps 1 to 4 are typically under 2 minutes. The vast majority of the gap between alarm and resolution is step 5 — the drive. Doubling the number of sensors does not change step 5.

What actually matters for response time

• How many response hubs the operator has, and where they are. A single hub on the other side of Kampala is a 35-minute drive. Nine hubs across the metro is a 9.2-minute median (our published number, audited).
• Whether the response unit is dedicated or shared with other clients. Shared units are cheaper and slower.
• Whether the dispatch is human-verified or automatic. Auto-dispatch on every alarm sounds fast; in practice it sends units on false alarms 60% of the time, exhausts the fleet, and slows real responses.
• How well the operator triages — video verification on alarms cuts false-call rates by ~80% and frees up the fleet for real events.

The alarm count trap

Doubling sensor count from 12 to 24 typically increases your false-alarm rate by 2.4× — small, sensitive sensors trip on the wrong things (dust, insects, HVAC drafts). Each false alarm consumes an operator-minute of triage, dispatches a unit (or burns the operator's patience to ignore the next one), and trains everyone in the building to assume the alarm is wrong.

Where to spend instead

If you have a fixed alarm budget, here is the order of return on every additional UGX million you spend:

1. Cellular + IP dual-path signalling. Single-path failures account for ~14% of missed alarms in Uganda — fix this first.
2. Video verification on every alarm. Drops false-dispatch by 80%. Frees response capacity for real events.
3. Geofenced response zones with pre-positioned vehicles. The single biggest determinant of step-5 drive time.
4. An additional response unit on the contract. Doubling response capacity halves your worst-case wait.
5. Then — and only then — extra sensors at specific blind spots, validated by site survey.

A 12-sensor system with a 9-minute response is a serious security posture. A 24-sensor system with a 28-minute response is a noise generator. Spend on the slow part of the chain.