You’ll find everything you need to know about baby monitors, and our recommendations for the best, below. TypeAudio Baby Monitors: The most basic type, audio baby monitors transmit only sound from the baby’s room to the parent unit. Local Video Baby Monitors usually last between 6 and 12 hours, depending on screen size and usage. You can find baby monitors with temperature monitoring to let you know if the room is too hot or too cold. Megan BackovichHow We SelectedI have experience with nearly all of the baby monitors on the list—whether it’s by testing them first-hand or watching friends use their own monitors.