SUUNTO D4 - Manual (Page 13)

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 manu-
facturer-specified batteries. Recycle or dispose of used batteries
properly.
NOTE It is not possible to change between AIR, NITROX and FREE
DIVE modes before the instrument has counted down the no-fly
time.
There is one exception to this: You can change from AIR to NI-
TROX 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.
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