Newland Symphone N2S User Manual page 29

To store the batteries, keep the ambient temperature
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between -20°C and 60°C.
high or low temperatures may cause a shorter battery life and a
reduced capacity. This is especially the case for low temperatures.
Keep metal stuff away from the receiver and speaker to avoid
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damage;
Avoid shocking or crashing the device, battery and charger, it may
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cause damage, fire or leakage;