Motion Sensor Alarm,Wireless Driveway Alarm Indoor Home Security Business Detector Alert System -Monitor&Protect Property - 2 Receiver and 3 PIR Sensor-38 Chime Tunes

Work great to let you know when someone or something is around

The media could not be loaded. UPDATE: I've recorded & posted a short video of all the sounds this device makes.I bought the bundle that included three sensors & two receivers. I'm using only one sensor, and because of the receiver alerts and volume (more about that below) I'm using both receivers. I'd like one or two more receivers, but in order to get more receiver(s) I have to buy more sensors, which I don't need. So too many sensors and too few receiers. The 38 alerts include mostly silly tunes that I cant imagine anyone giving seriously consideration to, except one - the ding-dong door-bell tone. So 38 silly tunes are (way) too many & yet there are too few common/simple alerts. I also find the quietest volume to be too loud to keep inside an occupied room, while the loudest volume is too quiet to keep outside in an unoccupied adjacent room with door closed. I did, however, eventually find through experimentation that placing a piece of duct tape over the receiver's speaker (in the rear of the receiver, not in the front) brings the volume of the receiver to a tolerable in-room level. I also found that the width of the sensor range is quite narrow. The sensor is triggered when someone or something crosses its path, but the passing object has to cross right in front of the sensor. I'd have liked the sensor to have a wider sensing angle so that it is triggered a few feet before the object passes directly in front of the sensor. Lastly, the sensor is very sensitive (that's a good thing). However, I initially mounted it in a small tree (~15' tall). In only a moderate wind (8-10 mph) the swaying of the tree and its branches triggered an endless number of false alerts. So i had to find a different mounting location. All-in-all, after lots of experimentation trying to get the sensor and receivers mounted and positioned properly, it's a good tool worth having (so long as the battery life lasts a few months - we'll see).

2nd purchase of these, I love the chimes that notify me when someone approaches area.

Information is not disclosed in the description whether all the sensors work independent of each other or as one. If you think you’re going to put one sensor by your doorway, another one at your gate, and maybe another one by your driveway and then get notified of which area the movement is detected, think again! No matter what sensor detects motion you get the same exact alarm! If you hear the alarm then you don’t know whether it was the gate, the doorway, or the driveway. All you know is that motion was detected at one of three locations! So if you want to run around to all the places motion was detected to figure out where it came from, then by all means purchase this product. If you look at other multi pack motion sensor devices for sale, they will disclose whether or not their devices work independently. Inferior products will not have this feature of working independently, but the seller should disclose that to reduce confusion or disappointment.Also, the description states that it has 38 different sounds to choose from. This product was obviously intended for the Asian market. Many of the “sounds” also contain loud voices which appear to be saying things in Chinese or similar. I have no idea what they are saying. Hopefully it’s something pleasant.And the directions, as usual, lack a lot to be desired. And be prepared to get your magnifying glass out. It can’t be because paper and ink is so expensive. The outside box is glossy and full of pictures and print, but the paper is small and the letters very fine print. When someone figures out why Asian markets do that, please let me know. And absolutely NOWHERE in the instructions do they tell you how to get to the battery compartment. There are no screws to hint at perhaps the battery location. There are no stickers. There are no markings on the device that state where the batteries are, or even an arrow indicating that you have to forcefully slide a nondescript compartment (not on the outside but deep inside the device ) from below these 4 tiny plastic notches (without breaking it), and THEN lift that compartment out, and then open the cover of that compartment to expose the area that would house the batteries! Geez! Why not add that important information to the substandard instructions that are enclosed?I was very aggravated and disappointed with this product — especially of the fact that these sensors cannot independently notify you of which sensor detected the motion (you get the same exact “alarm” no matter which sensor goes off). I couldn’t get to my Amazon app fast enough, to request a refund. To Seller: At lease disclose the full capabilities, or shortcomings, of this device, so the customer can make a qualifying decision on whether they want to purchase this device or not. What a waste of my time!Update (months later): The Seller is obviously not concerned about complaints or receiving 1 Star. The seller never reached out to me. The seller has obviously made no attempt to enhance or modify their description to serve customers better, by disclosing pertinent information. I think that speaks volumes.

I find it small, but it does the job. It's loud. It worth the price.

I purchased this to know when the mail had been delivered. I placed the motion detector in the mailbox and the receiver in the family room 100 feet away. It did not work.

These work great has ability to change alarms

Works well; good sound; good detection range.