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Retevis RT628S User Manual page 3

Wireless radio

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Battery Installation and Function
Your device uses 3 x AA alkaline batteries.
1.Place the back of the device to you, there is a hidden buckle to turn on/off the battery cover.
2.Install 3 x AA alkaline batteries as shown inside of the battery case.
3.Reinstall the battery cover and lock it down, the batteries can be replaced with NI-MH battery.
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