Multi purpose sensors. Works with Nest cameras and a handful of third party devices. Cons: Expensive. Doesn't support IFTTT or trigger other devices. Bottom Line: The Nest Secure Alarm Starter Pack is a stylish DIY smart home security solution that's easy to install and configure, but is very expensive, and lacks integration you get with some other systems. Read ReviewLifeShield Smart Home Security Kit ReviewMSRP: $199. 00 at Pros: Easy to install. Professional monitoring available. Comes with tablet controller. Works with Alexa voice commands, IFTTT, and Z Wave devices. Cons: Camera image quality could be better.