Easy to install and works great from my garage to house is is over 1/4 mile

I always wanted a driveway sensor for our property in another state, that has a 900+ foot driveway, so that we'd have a warning when someone was heading up into our woods/home, but they were very expensive and out of my reach.
The Hosmart set of four motion sensors with the base for the house/dwelling is VERY affordable, well made, and easy to set up. I am physically challenged, and figured out where my strategic areas were for trespassers on this property. There are 4 distinct channels, and also a sensitivity setting inside the unit. You will probably end up turning down the sensitivity as I did because it covers a LARGE area, and may cover more than you want at times. Easy to assemble and take apart, the batteries seem to stay charged for a good while too. It's important that you cut away branches, leaves, and other items that will trigger the sensor, just as you would for a trail cam.
When you have each sensor in the set of four set on it's own channel and distinctive tone/chime, you will find that channels 3 and 4 will NOT emit a flashing red light when the sensor is triggered. Apparently this is done on purpose, so that these two are NOT obvious/easy to see to those who come on your property. The chime still goes off for those sensors set on channels 3 and 4. I was involved from manufacturing to ISO 9000 Auditor in the electronic sub contract industry for 8.5 years, and I think these are quality products in comparison to a lot of junk on the market. These folks back up their products, give excellent customer support, and are a delight to deal with; VERY customer oriented. They REALLY want you to be happy with their products.
These sensors are TOUGH, and will handle rain, cold, etc. READ the instructions to avoid pointing them into direct sunlight. They are adjustable with a swivel nut on the back plate. By the way, a screwdriver that fits ALL screws is included, as well as masonry sleeves to screw into bricks in case you don't have wood. Honestly, I think that potential trespassers don't realize these are sensors, but rather cameras, and THAT deters them or keeps them guessing (LOL ). The distance on this property that I have them set up on can range up to 300+ feet, and there are lots of trees, plants, and other large objects in between the base unit in the dwelling and the sensors. This has NOT been a problem. I know that I can text Customer Service or call, and not be ignored like many companies that I have dealt with in the last two decades. Two thumbs up, and five stars.
UPDATE: Late 2021
My base set wouldn't work with new batteries or through the USB cord (electricity ). Called Customer Service and explained the problem, and that I needed to have the system up and running A.S.A.P. They were great! I received replacement base set quickly and was up and running! Excellent and hassle-free service. Thanks, Hosmart!

best if you pair these by pressing power button 5 sec till 4 zone lights flash then put your batteries in sensor and wave you hand , make it go off then do the others . DON'T do this at your house the neighbors may have one too . do this far away from your home over 1/2 mile you should not get false alarms this way but who knows this frequency is generic probably 433/315 or something like everyone else has been using for remote crap don't they know amazon sells tons of this stuff all using same frequencies . WE ALL HAVE THE SAME CRAP WORKING ON SAME CHANNELS, ITS ANNOYING AS HELL

This driveway alarm was very easy to install and get setup. No more false alarms and I really like that it has volume control. My wife has a home daycare so being able to turn the volume down is a great feature for her.

Wow these have some range. 1800 feet I'd say every foot of it. Only thing I'd change is the weird chimes. I'd prefer beeps or ability to select other noises. I got brown but just used black n green sharpies to Camo them up. I'd recommend for distance and learn to live with weird chimes.