SUUNTO D6 - Manual (Page 14)

WARNING This device contains a Lithium cell battery. To reduce the risk of
fire or burns, do not disassemble, crush, puncture, short external
contacts, or dispose of in fire or water. Replace only with
manufacturer-specified batteries. Recycle or dispose of used
batteries properly.
NOTE It is not possible to change between AIR, NITROX and GAUGE
modes before the instrument has counted down the no-fly time.
There is one exception to this: You can change from AIR to
NITROX mode even during the no-fly time. When planning both
air and nitrox dives during the same dive series, you should set
the instrument in NITROX mode and modify the gas mix
accordingly.
In GAUGE mode, the no-fly time is always 48 hours.
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