Features: IPX7 waterproof 4inch round loudspeaker with 25W power and 4Ω impedance delivers HIFI grade full ranges auditory, featuring a robust rubber edges and 80 magnet external magnetic for deeply bass and clear vocals. Engineered with hydrophobic coating and fully sealed structure, this 25mm voice coil ensures rapid heat dissipation, minimal distortion at high volumes, and shock resistant performances in extreme temperatures. Perfect for audiophiles crafting premium wireless loudspeakers, enthusiasts building outdoor auditory, and homeowners seeking bathroom/patio entertainment solution. Thrives in poolside parties, off road adventures, and humid environments like boats or saunas, protected by sandproof and vibrating resistant circular rubber suspension. Seamlessly integrates with mainstream wireless modules for multi device synchronization, combining studio grade 20Hz 20kHz frequency response with durability against saltwater corrosions and accidental drops. Specifications: Frequency response: 85HZ-15KHZ Size: Diameter about 110MM/4.33in Power: 25W Impedance: 4 ohms Sensitivity: 86x 2DB Magnetic circuit form: external magnetic type Frequency characteristics: Full band (full ranges) Package Includes: 1PC 4inch round 4Ω 25W rubber edges loudspeaker note: Please allow 1-2cm errors due to manual measurement. Pictures may not reflect actual color due to different monitors.