The Telex Airman ANR 500 provides excellent active noise reduction of up to 15dBs for a comfortable flight with reduced fatigue. Telex combined a symmetrical headband with plush cushioning, and adjustable pivoting ear cups for maximum comfort on your longest flights. For clear communication, the Telex ANR 500 features stereo/mono volume control—so you can mange the sound level depending upon your hearing needs. Additionally, the electret, noise-canceling microphone ensures that you come through clearly to the tower, your passengers or co-pilot. The Telex ANR 500 is FAA TSO approved.