... 4,laser pointer,MP3 play 5,LCD diplay classroom wireless microphones for teacher This model microphone is a bluetooth transmitter, ... -in-one unit, for revolutionary, cable-free convenience.More specifications:Transmitter(Holding) Frequency Scope: 2.4~2.483GHz Frequency Response Scope ... ~15KHz Modulation Type: GFSK,BT=0.5Gaussian Transmitting Power: 2.5mW Linking Mode: ID Coding, Auto-link locking Data ...