How do I know when the batteries in the remote control need to be replaced?
There are two signs that indicate exhausted batteries: the receiving beep is not emitted when a signal is transmitted, and the indicator fades away. Replace old batteries with new ones when either of these symptoms occurs. (Page 8)
From the official Olimpia Splendid Rg57a4 Rg57a6 Remote Control manual, page 8
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