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The U2 remote uses 2 AA alkaline batteries. For optimal performance, we do not recommend rechargeable batteries.
...U series remotes are compatible with IR and Bluetooth-enabled devices only. Please note that they do not support RF or WiFi connections.
...The U2 remote supports control of up to 15 total devices with the following specifications: Note: For devices supporting both IR and Bluetooth, we recommend using infrared mode for more stable multi-device control.
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