Ruizu D50 User Manual page 12

Q: Why my computer can't detect mp3 player?
A: RUIZU Mp3 player can be paired for all computer
system with latest USB driver. Please update your USB
driver before plug in Mp3 player or try another charging
cable. It you still can't connect RUIZU Mp3 Player to you
computer, please contact RUIZU customer service team
for additional help(See Cover).
Q: How can I continue audio play after turn the player off?
A: You can not continue your play after turn off the player.
However, if the player is in sleep mode, you can continue
your play by wake it up. See "Basic Operations" about how
to get into sleep mode.
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