Is your hair dryer safe? To find out, check the end of the cord. Is there an immersion protection device? That’s a plug with the red switch that pops out and cuts off the power if the drier comes into contact with water. For years now, most handheld hair driers have come with the immersion protection devices, but it wasn’t mandatory, so consumers have been put at risk. No more, the Consumer Product Safety Commission has issued new rules saying hair driers without the protection may not be sold.