One of the issues that popped up with the rise of electric cars is that, apart from tire noise, they’re totally silent, so pedestrians can’t hear them coming, especially at low speeds – and, since not every one is having their eyes on the road, this could result in accidents.

The solution legislators and automakers have come up with is noise generators that alert everyone in close range of the car’s presence. Tesla, for one, has added an exterior speaker system to its EVs, which was caught in action on a pair of Model 3s recently.

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The first video comes courtesy of Zach Feldstein and sees the noisemaker in action on his neighbor’s Deep Blue Metallic Model 3, which according to Teslarati was emitting the “Reverse” version of the noise meant to tell pedestrians there’s a car coming – or, in this case, backing up. While it’s definitely futuristic and fitting for a car with new-age tech, we think it also sounds a little bit weird.

We first heard about Model 3s getting a pedestrian noisemaker a couple of weeks ago, when a Tesla technician put the word out that the EV maker had started mounting exterior speakers to its smallest model. The technician also said that every Model 3 built after September 1st would feature this technology, which is capable of emitting two different sounds, one for low-speed forward driving and one for reverse.

There’s also a second video, courtesy of Tesla owner David, who caught a white Model 3 backing up slowly and sounding like something from The Jetsons. For some reason this doesn’t sound as wacky as the blue one, but that’s probably due to the proximity to the car’s speaker.

According to the NHTSA, pedestrian noisemakers will save 2,400 people from injuries and could prevent between $250 million and $320 million in damages. Thus, both electric vehicles and plug-in hybrids will be mandated by federal law to feature some type of noisemaker by September 1st, 2020.