You'll hear and feel the difference immediately.
When the ANR is ON, low frequency noise cancellation improves by an additional 18-24 dB.

Outstanding Features for GS-A2:
Great active noise cancelling level, average 20dB.
One 9 volt battery working time up to 48 hours
AUX jack for Cell phone with link cables included

Overview

• Ground Support Use Headset for Boeing or Airbus
• Active Noise Reducing
• Precision flex boom for perfect microphone placement
• Gel ear seal
• New Comfort foam, undercut ear seals
• Molded cord assembly made to exceptional pull and flex standards
• Noise-canceling Amplified Dynamic Microphone
• Straight cord from headset to molded plug, 900CM
• Color: Black, green
• Noise Reduction Ratings (NRR)
• ANR NRR 20dB
• PNR NRR 24dB
• Specifications
• Headphone
• Type: Dynamic (F40)
• Frequency Response:100 Hz to 8 kHz
• Sensitivity:95+/-5 dB SPL (1 kHz, 1 mW input per earcup side) full volume on ear simulator
• Impedance: 150 ohms (300 ohms each; wired in parallel)
• Rate Input: 100mW
• Max. Input: 250mW
• Microphone and Amplifier:
• Element Type: Noise-canceling Amplified Dynamic Microphone
• Frequency Response:150Hz to kHz
• Operating Voltage (supplied by aircraft ):8-32 Volts DC
• Matching Impedance: 150-1000 ohms
• Sensitivity:-13+/-4 dB (ref: 0dB SPL=20.0uPa at 1 kHz with 10 Vdc 150 ohms AC load)

General

• Operating Temperature: -25 to 70°C Storage: -50 to 75°C
• Cordage: Straight cord from headset to molded plug, 700CM
• Intercom Connections Plug:  (.25" 6.3Fplug) M642/2-2
• PTT Switch
• Weights: 540g
• Headset size range Height: 10 to 14 cm
• Color: Green/Black
• Boom: Flexible boom