Q-See QSNDVR16M User Manual page 26

Are the battery's poles (+ and -) in the correct position?
Is battery is out of power?
Is there is barrier between the Remote control and DVR?
Are signals transmitted by other remote control devices disturbing the Remote Control?
Attention: If none of the above apply, please contact Q-See to replace the remote control
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Fig2.1.1 PIP Fig2.1.2 POP
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