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Aerti Best Sale 8L Oxygen Concentrator for Home and Hospital. PSA Gas Separation Technology: Utilizes France imported CECA molecular sieve for high purity oxygen generation. Ultra-Quiet Operation: Super mute oil-free compressor ensures sound level below 50dB. 24/7 Continuous Operation: Suitable for 24-hour use with a long working life of 20,000 hours. Comprehensive Safety Alarms: Features power failure, over-heat, low purity, and high/low pressure alarms. Five-Stage Filtration: HEPA and bacteria filters effectively remove impurities, bacteria, and PM2.5. Large LCD Display: Shows total working hours, current time, and malfunction information. Multi-Color Options: Available in Creamy and Dark Gray colors to suit different preferences.