The Califone PA21 - EDU is an advanced PA system tailored for educational environments. This speaker delivers 100 watts of power and features a robust Bluetooth connection, allowing for seamless audio streaming. With a built - in rechargeable battery providing up to 5 hours of runtime, it ensures uninterrupted performance. Constructed from durable ABS plastic, the PA21 - EDU is designed to withstand the rigors of daily use in classrooms. It includes two wireless microphone receivers and a variety of connectivity options, making it versatile for different audio needs. The speaker's frequency response ranges from 50 to 20, 000 hertz, ensuring clear sound reproduction across a wide range of audio frequencies. Its integrated components and active amplification type enhance audio quality, making it an ideal choice for presentations, lectures, and other educational activities.