YouXing U-778, Руководство пользователя

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case damage it seriously.
3.Please keep the machine from direct sunshine or rains, And put it in
a place as far as possible from the magnetic field.
4.Don't open it yourself, because there is high voltage in it.
6.Caution
1.Since the installation of antenna influences the operating efficiency of
the receiver, the most important rule is to minimized the distance
between receiver antenna and microphone as short as possible for
better reception and performance.
2. The external DC power supply shoud not be below 12V,otherwise it
would not work properly. If it is over 15V, some components of the
receiver will be damaged due to higher current. Use minimum lA power
supply.