Opticon H21 - Manual (Page 25)

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1.9.4. Locking the Battery Cover
Before you can power the device on, you must lock the battery cover. Perform the following
procedures to lock the battery cover.
Step 1:
Use the tip of the stylus to perform the following
procedures. Do not use excessive force.
· First turn the Lock Button (A).
· Then slide the Lock Release to the lock position (B)
Note: The battery cover locks will only lock in this order.