1.Using UHF frequency band of 500~600MHz. 2.Using Quartz crystal frequency stabilization system. 3.Five hours of continuous use with highly efficient batteries. 4.LCD display shows status of frequency, AF and RF signal etc. 5.Up to 50m typical, with a maximum of 80m under ideal condition. 6.Standard 19 inch installation size, removable fixator and metal tube structure. 7.Design for KTV, conference hall, lecture and home entertainment. 8.Handheld, lavalier, headset can be mixed use. 9.Up to 5 sets used at the same time.