Dakota Alert SMA-4000 Smart
The motion kit to get if you want driveway alerts on your phone as well as a chime, with Dakota Alert’s one-mile radio.
Amazon $104.99$104.99
The Dakota Alert SMA-4000 Smart is the better driveway alarm overall, rated 3.7 to 3.5. The Dakota Alert SMA-4000 Smart leads on value. The Dakota Alert Smart Break Beam 4000 wins on features. The Dakota Alert SMA-4000 Smart costs $185 less ($104.99 vs $289.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Dakota Alert Smart Break Beam 4000
A solar break-beam with phone alerts, for covering a wide gateway or property line that a single motion sensor can’t reach across.
Amazon $289.99$289.99
Which should you buy?
- Choose the Dakota Alert SMA-4000 Smart for value ($104.99 per sensor ($104.99, 1 sensor) vs $289.99 per sensor ($289.99, 1 sensor)).
- Choose the Dakota Alert Smart Break Beam 4000 for features (phone alerts over Wi-Fi, relay or 12 V output, solar-charged sensor, per-sensor alerts vs phone alerts over Wi-Fi, relay or 12 V output, per-sensor alerts).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every motion and beam sensors driveway alarm; a clear win is highlighted. How we rank explains each one.
| Factor weight | Dakota Alert SMA-4000 Smart | Dakota Alert Smart Break Beam 4000 |
|---|---|---|
| Overall rating | 3.7/5 | 3.5/5 |
| Wireless range 30% | 100 1 mile claimed wireless range | 100 1 mile claimed wireless range |
| Value 25% | 42 $104.99 per sensor ($104.99, 1 sensor) | 1 $289.99 per sensor ($289.99, 1 sensor) |
| Features 25% | 50 phone alerts over Wi-Fi, relay or 12 V output, per-sensor alerts | 65 phone alerts over Wi-Fi, relay or 12 V output, solar-charged sensor, per-sensor alerts |
| Expandability 10% | 75 up to 16 sensors per receiver | 75 up to 16 sensors per receiver |
| Warranty 10% | 33 1-year warranty | 33 1-year warranty |
Specifications
| Dakota Alert SMA-4000 Smart | Dakota Alert Smart Break Beam 4000 | |
|---|---|---|
| Detection | ||
| Sensor type | PIR motion | Infrared break beam |
| Detection distance | 100 ft | 300 ft beam spacing |
| System | ||
| Wireless range | 1 mile (claimed) | 1 mile (claimed) |
| Sensors in box | 1 | 1 |
| Receivers in box | 1 | 1 |
| Sensors per receiver | Up to 16 | Up to 16 |
| Price per sensor | $104.99 | $289.99 |
| Alerts | ||
| Phone alerts (Wi-Fi) | Yes | Yes |
| Receiver power | Plug-in | Plug-in |
| Relay or 12 V output | Yes | Yes |
| Per-sensor alerts | Yes | Yes |
| Power and build | ||
| Sensor power | 9 V battery | Solar, rechargeable |
| Sensor battery life | A year or more on one 9 V battery | Battery operated, charged by two solar panels on each beam |
| Operating temperature | -30 to 120°F | -30 to 120°F |
| Warranty | 1 year | 1 year |