Blaupunkt WM40U Owner's Manual page 7

Many thanks purchase our model, this handheld wireless bidirectional
microphone adopted UHF(ultra high frequency) technology, and
includes 16 auto detection channels to avoid unwanted noise or
interference, which provide high quality sound transmission. Providing
6.3mm and 6.3mm to 3.5mm microphone convertor, which is vary to
connect with your microphone input jack from audio amplifiers, PA
system etc.. It is good choice for Karaoke, group events or performance
activities etc. Please read and reference this manual carefully before
operate the unit. Please keep the manual for future operation reference.
Control locations
1—Display;
3—reset button;
5—DC 5V input jack;
7---6.3mm Microphone plug; 8----rechargeable battery compartment;
9—signal LED indicator;
11—6.3mm to 3.5mm plug converter;
Setup
Install battery for microphone: Hold and rotate the tail of microphone
in anticlockwise direction to open up the battery compartment, insert
and install the supplied AA dry battery according to right positive and
negative polarity direction; push the power ON/OFF button to check the
display. Then hold and rotate the tail in clockwise direction to close the
battery compartment. The display will flash when the battery power is
low, and off when the power exhausted.
2—Microphone power ON/OFF button;
4—AA battery compartment;
6--- wireless receiver ON/OFF button;
10- charging LED indicator;
5