The noise level of these lightweight, easy to manoeuver and flexible lawnmowers is usually a bit lower than gas powered lawn mowers. But you shouldn't buy into the advertising hype because the difference isn't that significant. An average electric lawn mower usually emits 70 db of noise, for comparison, this is close to a car driving at 60 miles per hour. Best gas lawn mowers on the other hand, emits around 90-100 decibels. Similar to a revving motorcycle. Wearing hearing protection while mowing with a gas mower is highly recommended. But it is not necessary for electric lawn mowers unless you're going to be mowing for many hours, in that case, noise level could become unpleasant.