HumanTechnik RadioLight DIR Mode D'emploi page 13

2
When you first charge the battery packs for the headset receiver let
them charge for at least 14 hours. Only use original battery packs.
The package includes two battery packs and one dummy.
Radio range
3
The transmitter is designed to have a radio signal range of 80 metres
under optimum conditions.
The following conditions may result in a reduced range:
- Signal transmission through building structures or
vegetation
- Interference from TVs, computer monitors and mobile
phones. Under certain circumstances, this may prevent
the receiver from functioning at all.
Charging control light
Dummy
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