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1-3L Medical Grade Oxygen Concentrator to. Medical Grade Certification: Certified with ISO13485 and CE for medical institution use. Adjustable Oxygen Flow: Flow rate can be adjusted precisely between 1-3L. Remote Control Function: Includes remote control for convenient operation. Voice Broadcast Feature: Provides voice broadcast for user guidance. Timed Shutdown: Features automatic timed shutdown for safety. Dual Voltage Support: Compatible with 220V and 110V power supplies.