SUUNTO Stinger - Manual (Page 18)

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Therefore, provided the effort involved in freediving has not been severe, there is
little risk in diving after breathhold diving. However, the converse is more unknown
and may increase significantly the risk of DCI. Therefore, FREEDIVING AFTER
SCUBA DIVING IS NOT RECOMMENDED. You should avoid freediving and
not exceed five meters [16 ft] for at least two hours after scuba diving.
Suunto also recommends you to be trained in freediving technique and physiology
before conducting breathhold dives. No dive computer can replace the need for proper
dive training. Insufficient or improper training may cause a diver to commit errors
that may lead to serious injury or death.
Fig. 2.1. The push buttons of the
Stinger.