Under $100 buys a motion kit with one to four sensors, including Dakota Alert’s one-mile kits and solar kits from eMACROS, FULNIX and HTZSAFE. Vehicle-only probe kits mostly cost more. The Mighty Mule FM231 is the exception, with a shorter range.
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.
Best Driveway Alarms Under $100: Motion and beam sensors
- FULNIX DA01 Solar 2-Sensor Kit#1 of 9Full review
A two-sensor solar kit with a carry-anywhere receiver, for people who want to hear the driveway from the garage or yard.
Amazon $62.99$62.99PIR motion3,000 ft2 - eMACROS HS002 Solar 2-Sensor Kit#2 of 9Full review
A low-cost two-sensor solar kit for a driveway and a second entrance, when a chime in the house is all you need.
Amazon $69.99$69.99PIR motion2,600 ft2 - eMACROS Pro 4 Wi-Fi 2-Sensor Kit#3 of 9Full review
A Wi-Fi solar kit whose base keeps alerting through an outage, for homes where the power drops now and then.
Amazon $99.99$99.99PIR motion2,600 ft2 - Dakota Alert DCMA-4k Plus#4 of 9Full review
A one-mile motion kit with a relay-equipped receiver, for buyers who want a chime now and the option to wire in lights or a siren later.
Amazon $74.99$74.99PIR motion1 mile1 - eMACROS Pro3 Wi-Fi 2-Sensor Kit#5 of 9Full review
The cheapest way to get driveway alerts on your phone with two solar sensors, for a home on 2.4 GHz Wi-Fi.
Amazon $89.99$89.99PIR motion2,600 ft2 - Dakota Alert MTPR-4000#6 of 9Full review
A one-mile motion kit with a pocket receiver, for people who spend the day outside or in a workshop rather than by a wall chime.
Amazon $79.99$79.99PIR motion1 mile1 - Dakota Alert DCMA-4000#7 of 9Full review
The cheapest way into a one-mile Dakota Alert system, for a long driveway where a chime in the house is enough.
Amazon $69.99$69.99PIR motion1 mile1 - Wuloo Solar 2-Sensor Kit#8 of 9Full review
A budget two-sensor solar kit for an ordinary suburban driveway close to the house.
Amazon $52.99$52.99PIR motion1,760 ft2 - HTZSAFE Solar Beam 190 ft#9 of 9Full review
A budget solar break-beam for an entrance up to 190 ft wide, close enough to the house for a quarter-mile radio.
Amazon $89.99$89.99Infrared break beam1,320 ft1
Best Driveway Alarms Under $100: Vehicle-only sensors
- Mighty Mule FM231#1 of 1Full review
A low-cost buried vehicle sensor for a short driveway where the house sits within a few hundred feet of the sensor.
Amazon $67.98$67.98Magnetic probe400 ft1
