How can I tell how full the battery is?

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How can I tell how full the battery is?

The LIVE preview shows how full the batteries of the two transmitters are.
In a % specification and as a graphical representation (see below).

Note

Thanks to the Bluetooth low-energy technology the battery life is usually several weeks. As with conventional lithium-ion batteries, it is not necessary to constantly charge the battery to 100%. A capacity between 40-80% is optimal. Even if the device is not used for several weeks.