- This black booted button head provides a simple solution to comply with hygiene requirement in food, beverage industries as well as healthcare and pharmaceuticals. It is easily combined with Harmony™ range of contact blocks to perform a large variety of control functions. It is impact-resistant (strength), dust-resistant (strength), water-resistant (strength) and vibration-resistant (strength) thanks to its IP65, making it ideal for operation in harsh (heavy) environments.