Audience Size: Up to 100. Room Size: Up to 1,000 sq. ft. Battery-powered mini PA system you wear like a belt, leaving you hands-free and comfortable. Includes both headset and lapel (clip-on) mic and volume control. 5 watts max. sound output powered by six 'AA' alkaline batteries (not included). Save your voice For meetings, conference rooms, classrooms, on tours indoors or outdoors. For the teacher, trainer, or presenter, who needs a moderate improvement in her sound coverage and voice clarity - this personal mini PA is your solution. Easy to use. Comfortable to wear. 7"W x 2-1/4"D x 3"H overall.