The Stratus 30XT power management system allows you to power the headset from the aircraft panel, standard alkaline batteries, or rechargeable batteries. The Stratus 30XT offers a built-in battery recharger that recharges when plugged into a wall socket, the aircraft panel power or even your car's 12-volt power outlet. The Stratus 30XT automatically senses the type of battery you've inserted so you can't make a mistake. Our exclusive microprocessor-control battery management system ensures more than 50 hours of battery life - one of the longest on the market. Customize your headset for a comfortable fit Telex's patented ComfortCam™ system allows you to fine tune headband tension to eliminate clamping. Comfort is enhanced by a unique headband construction that distributes weight evenly for a perfect fit, plus thick foam headband pad and newly designed, more comfortable cushions. Audio device management made simple and Telex's innovative cell phone/MP3 adapter which allows you to attach your cell phone and MP3 player at the same time no more switching cords Plus you can mute both devices with the flick of a switch.