I installed a motion sensor inside a shed in my backyard (shed has a tin metal roof) and I kept getting a false alarm daily usually around 1 or 2pm; Ring informed me that their motion sensors use infrared technology and that excessive heat could cause a false trigger. They told me a contact sensor at the shed’s door should do the job and that’s what I will be doing next.
Update 1/24/16 - I have found a fantastic use for the Ring Doorbell and Chime. My mother-in-law, now in her 90s, lives by herself. She has become hard-of-hearing and often does not hear the doorbell. By installing the Ring on her door, she now is bothered much less (solicitors tend to recognize it and don't seem to like it) and when someone rings the bell, the Chime, placed by her favorite chair, gives her a better chance of hearing someone at the door.