About this item FM Headphones Radio, No AM Built-in premium DSP filter chip, the FM transistor radio has high reception sensitivity, allowing you to enjoy music, NPR or other FM programs at home or while hiking, cycling, or camping outdoors. Rechargeable Lithium Battery Operated The radio headphones are operated by a built-in rechargeable lithium battery, which runs up to 24 hours. The headset will be fully charged in about 2.5 hours. Say goodbye to expensive AA or AAA batteries forever. Preset Favorite Channel Preset your favorite channel, then you can quickly access it with a single click by pressing the M button. It can also be used as an emergency channel. Controls are easy and intuitive, and the back-lit LED display is convenient for night use. AUX Available The digital headset radio comes with an AUX jack (3.5mm aux cable included), suitable for smartphones, PCs, MP3s, etc. Compact & High Comfort Foldable and lightweight, making it easier to carry. Soft memory foam and adjustable