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Free US domestic shipping when you spend $150+
Specifications
RSD Pen 10mm dynamic Driver *2 Respnose Low Frequency
RSD Pen 6mm Dynamic Driver Response Mid low Frequency
RSD 4 Balance Armature Drivers Response Mid High Frequency
2 Electrostatic Driver Response High Frequency
4 way crossover
Frequency Response: 20hz ~~ 35000hz
Impedance: 28ohms 
Sensitive: 113db