auna Microstar Sing Manual page 41

Installing batteries into the remote control
The remote control operates on one CR2025 battery (included). To
activate the remote control, remove the insulation tab inserted in the
battery compartment. When the operation of the remote control becomes
intermittent or unsatisfactory, replace the original battery with a new
CR2025 lithium battery.
1. Slide out the battery holder from the remote control case.
2. Replace the 3V CR2025 battery. Be sure the battery is installed correctly.
The remote will not work if the battery is installed with the wrong
polarity.
3. Insert the battery holder back into the battery slot.
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