Hi,,,,I bought this driveway alarm because I wanted to be aware of who's coming and going. I found the alarm on a different website"¦.So I ordered it and it WORKS GREAT.. I emailed Hosmart to see if I could get Extra Monitors and they gave me the http/ address at Amazon for the second purchase. I ordered the 3 extra monitors tried to connect them and I lost ALL signals from the first purchase"¦.. so I emailed Hosmart for help and in less than 24 hrs they answered me back with an apology and a video how to solve the problem. Every thing works GREAT now! Thank you Hosmart for everything!! ( I just want to be clear I ordered "3" items"¦.NOT 1. Thanks again!!

worked well for a month batteries in the receiver unit went low, change the batteries never work again, Order new receiver, never pared up to the outdoor sensors. brought the sensors inside tried a close range
nothing. followed the instruction to the t several times nothing no customer service

had a kittle trouble paring the sensors but it works well

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!

We have used driveway alarm over 2 years. Battery stays charged a long time. Mounted on a tree in front yard to alert us anything coming in driveway. We had one small issue of the screw nut breaking...I sent text to company..they replied within a day. Sending me a FREE part !!

This device worked after a little playing with it not a bad system..... Mousie