Type Electrostatic canal type In-The-Earspeakers, push-pull drivingFrequency Response 20-20kHz ±4dBCapacitance 44pF with cordImpedance 360K ohm/10kHzSensitivity 110dB/100Vr.m.s. /1kHz Maximum Sound Pressure level 119dB/1kHzStandard Bias Voltage 540V-580VEarpad 3 sizes, S, M and L (M size is factory installed)made by silicon rubberCord 5-pin PRO bias cord 1.5m (6 core parallel)Size 28mm (diameter)Weight 38g (Overhead Arc: 15g)