Features: Built-in mic records student achievements, can"t be misplaced 500mW amplifier loud enough for class sizes up to 20 people Sturdy function buttons are easy to operate for independent learners Volume control 2.5mm/3.5mm remote mic input (#4805 sold separately) for recording flexibility 1/4" headphone jack for independent study or connect a jackbox for group learning Additional 1/4" headphone jack for a second listener or to connect an external speaker for group listening Rugged ABS plastic exterior for added durability and safety