Review on Long Range Wireless Driveway Alarm System with Motion Sensor - 1800 Feet Detection Range and Rechargeable 1800mAh Battery (1&1-Brown) by Ben Demers

Perfect for what I need. I have a very long driveway and I have the sensor a damn far from home and it works for everything. People, deer, bears and most importantly cars (which is why I got it). I had to turn the sensitivity down because it caught every leaf blowing in the wind. I can choose all kinds of tones and alerts and I can even take the receiver with me anywhere (within range lol) as long as I put batteries in it. It's pretty cool. Especially for the paranoids who want to know when anything human (and sometimes even a deer or a bear) is coming my way and approaching my house. I like to be ready before anyone pulls up. Just in case.