They let you see what's going on at your home by being alerted of movement since it occurs. All Blink cameras are simple to install and operate on 2 AA one.5V Lithium Steel Batteries which could final as much as two several years!** MPM is actually a premier on-line marketplace http://spencerohzsl.fitnell.com/29894654/indicators-on-security-camera-systems-sales-in-orlando-fl-you-should-know