Sony MDR-1A-B Specifications

- High-Resolution Audio 40mm HD driver unit
- Aluminum-coated Liquid Crystal Polymer Diaphragms for absolute clarity
- L/R separated ground cable for reduction of cross talk 
- Silver-coated Oxygen-Free Copper cable
- Hands-free calls with in-line remote and microphone
- Comfortable, ergonomic ear pads
- Plug - Gold-plated L-shaped Stereo Mini; Four-Conductor Gold-plated L-shaped Stereo Mini

Microphone
- Unit/Type : Electret Condenser
- Open circuit voltage level : -40dB(0db=1V/Pa)
- Effective Frequency of Microphone : 20Hz-20,000Hz