The Revolabs Classroom Wireless Amplification system makes it simple to add a wireless microphone and speakers to a classroom or lecture theatre. The kit comes with a wireless lapel mic and charging cradle, wireless receiver and a pair of powered speakers. The wireless mic is apparently impervious to RF interference from PDAs and phones (darn kids and their texting), runs for 8 hours and can be recharged to 85% in 45 minutes. Priced around US$849.
The Revolabs Classroom Wireless Amplification System allows the teacher to speak in a normal voice and the students can hear every word. Unmatched audio performance with wireless convenience is brought into the classroom.