The speaker surface is waterproof.e for 1pcs.Ts:If you want to Enhance more Ba, Please add a :3inch Paive tructure: 68MM strong + rubber side + tin terminal + Composite aluminum basin+ bracketType: full range speakersSpeaker height: 45nstallation height: 41MMFront diameter: 83MMDiagonal panel diameter: 102MMDiagonal screw distance: 92MMThe same side of the screw from: 65MMOpening: 70MM: 68mmSensitivity: 90dbWeight: 430gPower: 15-40W 4Frequency Range:60Hz-20KHzFeatures:The copper ring, copper short circuit ring, which protrudes from the T , greatly improves the high frequency response and reduces the distortion in the low frequency and extended high frequency regions.Blaanodized aluminum pot, than the cone lower distortion, better heat diation of the aluminum ring,Its blaaluminum dust cover directly connected to the voice frame, dust cover below the ventilation treatment, which will help cool, the other rubber ring design in partiar, both to deal with dynamic linear frequency response, but also deal with large ion input signalPackage included:1pcs 3 INCH Speaker