... CD,PC input 4.afforadable,wall mount 2.0 Multimedia Classroom Speaker ,2.0 Multimedia Active Speaker,Multimedia Active Speaker, ... hundreds of classroom, you only need to give one 2.4GHz transmitter to each teacher, whatever which room the teacher in, it works at the ... UNION,ALIPAY,ESCROW is available.Please settle the payment with in 5 days from the end of auction.Positive will be left after received ...