Think Outside Stowaway Universal Bluetooth Keyboard - Manual (Page 30)

Page 30
There are few possibilities for outdoor use: On private property or on the
private property of public persons, use is subject to a preliminary
authorization procedure by the Ministry of Defence, with maximum
authorized power of 100 mW in the 2446.5–2483.5 MHz band. Use outdoors
on public property is not permitted.
In the departments listed below, for the entire 2.4 GHz band:
Maximum authorized power indoors is 100 mW.
Maximum authorized power outdoors is 10 mW.