General Usability: This one is two-fold. First we wanted to make sure each monitor could perform under bright, dim, and no light; and pick up even the faintest sounds. Then we looked at how easy it was to use the monitor. Could we adjust the screen brightness, or were we going to be half-blinded when we picked it up at 1AM? Was the monitor voice-activated, or does it pick up white noise in the background? How sensitive were the alarms, and did they sound like a baby-waking screech or a soft ping?
A word of caution about extremely cheap baby video monitors (we're talking devices that cost less than $50): they're not known for their security and can be hacked. Be sure to always change the default password of any connected device you purchase. You can also protect yourself by sticking to known vendors who post frequent firmware updates and have easy-to-reach customer support.
The Babysense 7 movement product is a sensor pad mattress product that isn't portable but seems to have fewer false alarms than wearable products. The BabySense 7 is easy to use and doesn't require much setup or preparation outside of placing the sensor and control unit. This unit even works well after your baby learns to roll over, unlike the wearable options that become less reliable as your little one's age.