SR-002 SPECIFICATIONS:
Type: Push-Pull electrostatic circular sound element, 
In-The-Earcanal type enclosure
Frequency Response: 20-20kHz (4dB)
Capacitance: 44pF (including cable)
Sensitivity: 110dB / 100V r.m.s. 1 kHz
Bias Voltage: 550-580V DC
Ear Pads: Silicone earbuds (Small, Medium, or Large) Medium included
Cable: parallel 6-core, 1.5m full length
Weight: 0.4oz without cable / 1oz with cable 
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SRM-002 SPECIFICATIONS:
Frequency Response: 20 to 20kHz
High Harmonic Distortion: Max 0.1% (1kHz at 100V r.m.s.)
Gain: 54dB
Rated Input Level: 100mV / 50V Output
Input Impedance: 10KΩ
Max. Output Voltage: 230V r.m.s. (1kHz)
Power Consumption: 0.75W (alkaline battery) 1.2W (AC adapter)
Dimensions: 5.2 (W) x 1.5 (H) x 5.2 (D) in
Weight: 3.6oz without battery
Battery: Size AA battery x2 (Alkaline battery, Rechargable, Magnesium Dry Cell)
Continuous Operating Time: 5hrs or more with Alkaline battery on ECO mode, 4hrs or 
more with Alkaline battery on normal mode
Operating time may differ depending on volume level and battery type
AC adapter: DC4.5V/300mA, Polarity EIAJ TYPE2 (optional)