1.Efficient,sensitive,highly reliable and rugged capsule construction. parameters:1.Rated Voltage:24V2.Coil Resistance:22Ω±10%3.Frequency Range:300-3400Hz4.SPL(1KHz,1M):≥95dBDimension:Φ46.5mmX17mmOTHER COIL RESISTANCE IS AVAILABLE Rocking Armature Transducer