All of our electronic products are designed and rated for use in the United States using 120 volt current. We advise you to use a reputable carrier service when returning your goods. Please check the Voltage information and make sure it matches the one in your country. In case it’s not stated in the description, do ask us. We guarantee that your issue will be solved quickly. We usually respond within 24 hours on weekdays. Mesh A quintessential investment for your office – the H4 Engager is our headrest in size with a pillow size over 20%, and has more adjustability than the H3 with a maximum height of 11″ and a maximum front reach of 8″ allowing total engagement in an upright sitting position. H4 is recommended for all users who are looking for maximum comfort and fit and better fit than the h3 for people taller than 5’11. Lead colour – perfectly matches your Herman Miller Aeron mesh chair with lead. Fully adjustable – the full h4 headrest extends further and higher providing more engagement than its predecessor the H3. The H4 is recommended for users who like the headrest to fully participate in vertical and forward / reclining positions. Three different adjustment options allow you to fully customize your experience, ensuring your comfort is totally tailored to your personal preferences. The patented design is suitable for all models of Herman Miller Aeron chair and configurations. Engineered Now The Original Headrest for The Herman Miller Aeron Chair H4 for. We do not accept P. BOXES – PLEASE PROVIDE A PHYSICAL ADDRESS.