SR-207 Earspeakers + SRM-252S Driver Unit SR-207 Earspeakers Type Electrostatic, Open Frequency Range 7~41,000Hz Capacitance 120pF (including cable) Impedance 132KΩ (including cable at 10KHz) Sensitivity 101dB/100V rms Standard bias voltage 580 VDC Cable 2.5m, 6 strand, Wide format, Low Capacitance Weight with cable 490g, without cable 340g Total Weight in Retail box 800g Standard Earpads EP-234BL Compatible Earpads EP-234 series SRM-252S Driver unit Frequency response: DC ~35 kHz (40 Vr.m.s. when using one SR-207) Rated input level: 200 mV with 100V output Maximum input level 30 V r.m.s. at minimum volume Amplification: 58 dB (x800) Total harmonic distortion  max. 0.01% at 1 kHz 100Vr.m.s. (when using one SR-207) Input impedance 50 kΩ Maximum output voltage: 280 Vr.m.s. / 1 kHz  Standard bias voltage DC580 V (PRO bias) Power DC12V, 4W Temperature Between 0-35 degrees, max. 90% (no condensation) External dimensions 132（W）×38（H）×132（D）mm Weight 540g XLR terminal polarity No. 1: Sealed No. 2: Hot No. 3: Cold (European) SRS-2170 Basic System Weight in Retail Box 1500g		Japan Made. Highest manufacturing standard Contents .. SR-207 Earspeakers SRM-252S Driver Unit AC100v adapter . We sell Voltage Converters. Japanese Manual Supplied by Authorized Resellers in Japan. 1 year Japan Warranty from the day we sent your parcel. We can help you liaise with the maker in Japan. You will pay for postages to/from our Japan office. Singapore and Malaysia buyers can bring/post to us locally. We will deliver FREE to/from Japan. Return postage chargeable.