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Features: Quantity: 2pcs Specification: 20x1.2mm (as picture shown,ceramic disc diameter is 20mm (not include rubber ring)( with ring diameter is 25mm) Resonant frequency: 1.70MHz Resonant impedance: < 2 ohm Coupling factor: > 52% Static capacitance: 1800pF Atomization quantity: < 380ml/h Note: Lighting, display and other factors may cause COLOR SHADING, please comprehensive pictures and text descriptions to determine! Package Includes: 2x D20mm Ultrasonic Mist Maker Fogger Water Fountain Ceramic Humidifier