Our monitor was place at the end of the hallway with the door closed, roughly 20m away from the parent unit. Monitor wasn't picking up any noises and kept dying really quickly. After reading the manual we adjusted to the max sensitivity setting and it picks up noises now but dies even quicker. Coming from a monitor that used to last close to a week on a full charge, this one seems to barely last a day or two and the max sensitivity the monitor needs to be on just to hear my children at all makes the battery run out faster. I would have to have it permanently on charge to feel comfortable using it to the extent I need it. I keep the door to the hallway ajar and hear them quicker then the monitor does. Super disappointed in the purchase. Would not recommend