Sony DR 270DP
Driver Unit 30mm
Type Open air, Dynamic
Microphone Boom Microphone (Minimize surrounding noise) 
Driver Unit 30mm
Type Open air, Dynamic
Microphone Boom Microphone (Minimize surrounding noise) 
General
Type : Dynamic, Closed
Driver Unit : 30mm, Dome type
Sensitivity : 102dB/mW
Power Handling Capacity : 1,000mW
Impedance : 24 ohms at 1kHz
Frequency Response : 14 - 22,000Hz
Cord Length : pprox. 1.2m
Plug : Gold-Plated Stereo Mini Plug (For Headphone Plug), Gold-Plated Mini Plug (For Microphone Plug)
Weight (without Cord) : Approx. 87g
Supplied Accessories : 1 x Carrying Case
Microphone
Unit/Type : Electret Condenser
Frequency Range : 20 - 20,000Hz
Open circuit voltage level : -35dB