4 channels.Adjustable frequency.

IR automatic. Totally 400 frequency.Each channel has 200 optional frequencies, stepping up/down by 0.25MHz.

20 controllers can used simultaously.

LCD screens show working status on the receiver and emitter.

Handheld microphone power consumption is 80mA. With 1.5V*2 battery power supply, it can work constantly for 5 hours.

Beltpack microphone power consumption is 80mA. Built‐in lithium battery power supply, it can work constantly for 8 hours,

Beltpack mircrophone is metal body,handheld microphone is metal body.

Working distance: 50‐80 meter.

It's suitable for various kinds of meeting occasion