A 75mm diameter circular loudspeaker of 8 Ohm resistance.Contains a high flux ceramic magnet of nominal power rating 5W.Mounted in a rectangular plastic case and with two 4mm sockets for connection.Despite its relatively small size this unit will provide a useful level of sound over the whole audio frequency range.Dimensions: 150mm x 135mm x 40mmResistance: 8 OhmPower Rating: 5WIncludes a boss for mounting the loudspeaker onto a retort stand rod of up to 10mm diameter.