The Stratus 30XT provides excellent ANR noise reduction, Comfort- Cam™, advanced power management, and audio device adaptors for the best headset in the median price range.The Telex FlexPower ™ system allows you to use standard or rechargeable batteries, or the aircraft electrical panel to power your headset (adaptor included). Exclusive power management system ensures more than 50 hours of battery life— one of the longest on the market. The Stratus 30XT has Telex’s exclusive built-in audio interface that allows you to connect both your cell phone and MP3 player and mute both devices with one easy on/off switch. Boom microphone enables precise adjustment and features noise-canceling electret for clearest transmission. Deluxe carrying case included. 5-year warranty.