Descriptions: Specification: 20x1.2mm Resonant frequency: 1.70MHz Resonant impedance: 52% Static capacitance: 1800pF Atomization quantity: <380ml/h Quantity:1Pc Notes:20mm diameter is to remove the size of the pastic Ring On the atomization of the film 2 wires, because the batch is not the same, sometimes red and black, sometimes yellow and blue, the other does not affect the use Size for manual measurement, there may be a 0 to 2 cm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes(no retail package):1Pc x D20mm Ultrasonic Mist Maker Atomizing Transducer Ceramic Humidifier Accessories