LG TONE Free TONE-DFP9 Owner's Manual page 25

Frequency range
2402 MHz to 2480 MHz
*Duration of use may vary depending on the connected mobile device,
features being used, settings, signal strength, operating temperature,
frequency band, and other methods of use.
Output Power (Max)
Earbud : 11.5 dBm
Charging case : 10 dBm
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