Seven levels protections: with IPX7 rating, the full rubber encapsulated cone and coating on the iron shell circuit allow temporary immersion without internal damage. Double Magnet Inner Structure: 2.25Inch 18core Double inner structure, this closed circuit enhances field strength and damping for deeper bass, dynamics, and reduced distortion. Standard Parameter Compatibility: With 4ohm impedance and 10W power (12W ), this 2.25Inch round speakers fits most standard speakers enclosures. It is an excellent replacement Rubber Surround Concave Cone Diaphragm: High compliance rubber surround paired with a concave paper cone provides excellent aging resistance, cracking or deformation in humid environments. Technical Specifications: Sensitivity 81±2dB, frequency ranges 170Hz 20kHz, total harmonic distortion 5%, weight 58.8G, and 57mm. This 2.25Inch 4Ohm 10W speakers delivers balanced for portable applications, ensuring output for outdoor music enjoyment.