Devilbiss Oxygen concentrator model no. 525KS is one of the most exemplary product available in the segment of oxygen concentrators. It is very well designed and weighs only 17kg; which can be easily treaded in the house or in nursing homes or hospitals. Specifications: Small, light and sleek design Ergonomic finish Very quiet; almost noiseless No maintenance Consistant performance Molded handle for easy clasping and movement All size humidifier velcro Internal tubing storage; so you never misplace the tubing metal canula for better durability Recessed flow metere; hence reduced chances of breakage Easy interface with alarms on display Easy installation Built upon a legacy of reliable, field-proven concentrator models, the DeVilbiss 5 Liter Oxygen Concentrator was updated with enhanced quality, durability, performance and simplicity in mind. Made in the USA, this robust oxygen concentrator offers just the right balance of cool and quiet. The simplified, two-piece cabinet design allows for 15% typical sound quality improvement and an improved cooling process. Paired with proven, exclusive DeVilbiss Turn-Down Technology, these improvements minimize wear on internal components and increase the life expectancy of the unit. In fact, recent production statistics show a less than 3% warranty return rate. The concentrator is easy to assemble and disassemble, and it requires no maintenance for two years.