A double-barreled handgun that folds up to look like a smartphone is worrying police officers.

Developed by Minnesota startup Ideal Conceal, the pistol folds into a palm-sized square. "Smartphones are everywhere, so your new pistol will easily blend in with today's environment," explains Ideal Conceal, on its website. "In its locked position it will be virtually undetectable because it hides in plain sight."

The gun can be safely carried in a purse or clipped to a person's side, the company added.

However, the gun's resemblance to a smartphone is making police officers nervous, CNN Money reports.

"In general, the concept of any kind of weapon that's disguised, so that it's not apparent that it's a weapon, would be cause for concern," said Bill Johnson, executive director and general counsel for the National Association of Police Organizations.