Description: <br> Turn any surface/wall/table etc into a speaker with a surface transducer. This type of speaker does not have a moving cone like most speakers you've seen. Instead, a metal rod is wrapped with the voice coil. When current is pulsed through the coil, the magnetic field causes a piece of metal to expand and contract - and if it's pressed against a surface it turns the transducer into a speaker! <br> Often these size transducers are pressed up against a flat surface to turn it into a sounding board. The effect is a surprisingly clear sound that comes from the surface itself. The body of the transducer is heavy so that it can be placed with the rubber top down on a table. And for another fun trick, put the transducer at the end of a large plastic cup to point sound in a particular direction. <br> This transducer is about 45mm in diameter and has 4Ω impedance and should be run at about 5W <br> Dimensions: <br> Height: 27mm / 1" <br> Diameter: 45mm / 1.8" <br> Length of Wires: 120mm / 4.7" <br> Weight: 174g <br> Specs: <br> Impedance: 4Ω <br> Power rating: 5W