The Philips Respironics OptiChamber Diamond Anti-Static Chamber With Small Mask is smaller than most conventional chambers. OptiChamber Diamond's intuitive design enhances medication delivery and compliance for patients of all ages, at home or in the hospital. OptiChamber Diamond is also ideal if you administer medication to someone else as the exhalation valve visually confirms exhalation, helping you count patient breaths and co-ordinate actuation. OptiChamber Diamond is designed to be replaced after one year of use.