The 8101 is built for use in schools with integrated volume control for safety, dual headphone jacks for multiple listeners and a microphone for podcasting. It is ideal for nurturing language learning & reading skills, ELL, ELD applications and listening to recorded books and music. Connects up to two headphones at one time Built-in mic records podcasts, vocal responses, tracks student progress, is ideal for testing and can't get lost Right angle plug resists accidental pull-out LCD screen displays the current track status, track number, total tracks, track time and more Ambient noise-reducing earcups for student protection USB connector transfers tracks to computer and while connected, fully recharges the internal battery in 5 hours Accommodates up to a 2GB SD card (not included) External casing made with rugged ABS plastic for safety and durability in high-use situations Maximum playback volume level set to 85dB (meets American Speech-Language-Hearing Association recommendations for safety