Ruizu D16 - 4.Lock Screen; 5.Return; 6.Volume Adjustment; 7.Headphones and Speaker

4
If it still can’t work for you. Ask RUIZU Customer
Service for additional help. (See Cover)
4.Lock Screen
Hold the Menu button to lock the screen. Repeat to
unlock it.
5.Return
While on playing interface, touch the button to
exit.
6.Volume Adjustment
Use the Volume Control button on the right to adjust
the volume.
Note: There’s a built-in speaker in RUIZU D16 MP3
Player, the speaker will turn on automatically when
no earphones are plugged in.
7.Headphones and Speaker
RUIZU MP3 Player only support Headphones with
impedance 16Ωor 32Ω. Built-in Speaker could be
turn off, see “Settings”.