Features: 4inch 4Ω 25W IPX7 waterproof bass speaker, used for home theater. Quality material, oxidant resistant, moisture-proof, and long service time. With 84±2dB/W high sensitivity, clear sound directionality. This waterproof subwoofer speaker component delivers clear and no distortions with a total harmonic distortions of just 5% Easily fit into any setsup, providing reliable performances and superior sound quality for all your multimedia applications. Specifications: Material: Rubber Edged Color: black Size: approx. 104.5x59mm/4.11x2.32inch Type: 4inch curved 4Ω 25W speaker Voice coil: 25 cores Sensitivity: 84±2dB/W Power: 25W Power: supports up to 30W Total harmonic distortions: 5% Impedance: 4Ω Working temperature:- 18-60℃ Frequency: 70HZ-5KHZ Waterprof: IPX7 Package Includes: 1 Piece 4Ω 25W External Speaker note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.