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 3.6. The Dakota Alert SMA-4000 Smart leads on wireless range and expandability. The HTZSAFE Solar Motion 4-Sensor Kit wins on value. The Dakota Alert SMA-4000 Smart costs $15 less ($104.99 vs $119.99).
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.
HTZSAFE Solar Motion 4-Sensor Kit
Four solar motion sensors for watching a driveway, gate, path and shed at once, with nothing to recharge.
Amazon $119.99$119.99
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) and expandability (up to 16 sensors per receiver vs up to 4 sensors per receiver).
- Choose the HTZSAFE Solar Motion 4-Sensor Kit for value ($30 per sensor ($119.99, 4 sensors) vs $104.99 per sensor ($104.99, 1 sensor)).
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 | HTZSAFE Solar Motion 4-Sensor Kit |
|---|---|---|
| Overall rating | 3.7/5 | 3.6/5 |
| 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) | 93 $30 per sensor ($119.99, 4 sensors) |
| Features 25% | 50 phone alerts over Wi-Fi, relay or 12 V output, per-sensor alerts | 50 solar-charged sensor, 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 | 0 warranty not published, scored as none |
Specifications
| Dakota Alert SMA-4000 Smart | HTZSAFE Solar Motion 4-Sensor Kit | |
|---|---|---|
| Detection | ||
| Sensor type | PIR motion | PIR motion |
| Detection distance | 100 ft | 70 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 | $30 |
| 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 | Solar, rechargeable |
| Sensor battery life | A year or more on one 9 V battery | Built-in rechargeable battery charged by solar |
| Operating temperature | -30 to 120°F | - |
| Warranty | 1 year | - |