Applying only 1.2 ounces of force will activate the Pal Pad. They can be activated with the slightest touch whether it comes from directly above or at a shallow angle. You can plug them into any communication aid or switch-adapted, battery-powered device. Pal Pads are flat membrane switches approximately 1/10th of an inch thick yet are very rigid and durable. They are designed to be tolerant of rough usage. The Mini Pal Pad measures 2 x 2 inches