Sony MDR-NC40 Noise Canceling Headphones (In-store Only)

Audio
Driver Unit 30mm Dynamic, closed, dome-type
Frequency Response 14 - 22,000Hz
Impedance 68 ohms at 1kHz (on); 30 ohms at 1kHz (off)
Noise Level ON/OFF switch on battery box
Sensitivity (db) 102dB/mW (on); 100dB/mW (off)
General
Design Premium over the head, Noise canceling
Headband Adjustable and Foldable
Magnet Neodymium
Plug L shaped stereo mini plug (Gold)
Type of Use Noise canceling
Hardware
Cord 4.9 foot OFC litz cord (Including battery box)
Headphone Type Closed, dynamic
Power
Battery Indicator yes
Battery Life (Approx) Up to 40H (with alkaline battery)2
Battery Type DC1.5V, 1 ROE (size AAA) battery
Power Handling Capacity 50mW
Weights and Measurements
Cord Length (Approx.) 4.9 foot (1.5m) including battery box
Weight (Approx.) 3.8 oz. (107 g)-without battery, 4.2 oz (119 g)- with battery 4