Samsung HMX-H300BN/HMX-H300SN/HMX-H300RN/HMX-H300UN - Manual (Page 25)

Getting started
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ATTACHING THE GRIP BELT
Adjust the length of grip belt so that the camcorder is stable when you press the Recording start/stop button with your thumb.
If you make the grip belt too tight and use excessive force to insert your hand, the grip belt hook of the camcorder may be damaged.