Samsung Galaxy WatchActive 2 User Manual page 16

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While charging, the device and the charger may become hot. This does not affect the
device's lifespan or performance and is in the device's normal range of operation.
Remove the device from the charger and wait for the device to cool down. For more
information, visit https://www.samsung.com/us/support/answer/ANS00076952.
NOTE Do not disassemble, modify, or repair your device. Placing objects, such as
magnetic stripe cards, including credit cards, phone cards, passbooks, and
boarding passes, next to the device or charger may cause damage from the
charger or device's magnetic field.
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