MicroLinks VT300 - user guide - Manual (Page 29)

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(3) Install Battery: remove the battery cover and input the battery
by placing the written face up and complying with positive
and negative poles correctly. Close battery cover finally.
Please refer to the following image.
(4) Install Wrist Strap: Remove battery cover. Hang the wrist
strap on the hook, then close the battery cover. Please refer to
the following image.