Sealife Reefmaster RM-4K - Getting to Know the Underwater Housing

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Getting to know the underwater housing
1 – Lens port
2 – Lens adapter ring
(For attaching lens accessory)
6 – Connect lanyard or retractor here
7 – Power/Mode/Back 1-step button
8 – Shutter/OK button
3 – Drainage hole
4 – Pressure locking thumbscrew
5 – LCD Display