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 and the Hosmart Half-Mile 4-Sensor Kit are evenly matched, rated 3.7 and 3.7. The Dakota Alert SMA-4000 Smart leads on wireless range, expandability and features. The Hosmart Half-Mile 4-Sensor Kit wins on value and warranty. The Dakota Alert SMA-4000 Smart costs $27 less ($104.99 vs $131.99).
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.
Hosmart Half-Mile 4-Sensor Kit
A four-sensor battery kit with the longest published warranty here, for buyers who would rather swap AAs once a year than rely on solar.
Amazon $131.99$131.99
Which should you buy?
- Choose the Dakota Alert SMA-4000 Smart for wireless range (1 mile claimed wireless range vs 2,640 ft claimed wireless range), expandability (up to 16 sensors per receiver vs up to 4 sensors per receiver) and features (phone alerts over Wi-Fi, relay or 12 V output, per-sensor alerts vs battery-powered receiver, per-sensor alerts, adjustable sensitivity).
- Choose the Hosmart Half-Mile 4-Sensor Kit for value ($33 per sensor ($131.99, 4 sensors) vs $104.99 per sensor ($104.99, 1 sensor)) and warranty (2-year warranty vs 1-year warranty).
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 | Hosmart Half-Mile 4-Sensor Kit |
|---|---|---|
| Overall rating | 3.7/5 | 3.7/5 |
| Wireless range 30% | 100 1 mile claimed wireless range | 73 2,640 ft claimed wireless range |
| Value 25% | 42 $104.99 per sensor ($104.99, 1 sensor) | 89 $33 per sensor ($131.99, 4 sensors) |
| Features 25% | 50 phone alerts over Wi-Fi, relay or 12 V output, per-sensor alerts | 35 battery-powered receiver, per-sensor alerts, adjustable sensitivity |
| Expandability 10% | 75 up to 16 sensors per receiver | 25 up to 4 sensors per receiver |
| Warranty 10% | 33 1-year warranty | 67 2-year warranty |
Specifications
| Dakota Alert SMA-4000 Smart | Hosmart Half-Mile 4-Sensor Kit | |
|---|---|---|
| Detection | ||
| Sensor type | PIR motion | PIR motion |
| Detection distance | 100 ft | 30 ft |
| Adjustable sensitivity | - | Yes |
| System | ||
| Wireless range | 1 mile (claimed) | 2,640 ft (claimed) |
| Sensors in box | 1 | 4 |
| Receivers in box | 1 | 1 |
| Sensors per receiver | Up to 16 | Up to 4 |
| Price per sensor | $104.99 | $33 |
| Alerts | ||
| Phone alerts (Wi-Fi) | Yes | No |
| Receiver power | Plug-in | Plug-in with battery backup |
| Relay or 12 V output | Yes | No |
| Per-sensor alerts | Yes | Yes |
| Power and build | ||
| Sensor power | 9 V battery | AA batteries |
| Sensor battery life | A year or more on one 9 V battery | About a year on 4 AA batteries (not included) |
| Operating temperature | -30 to 120°F | - |
| Warranty | 1 year | 2 years |