Whistler WIC-3509P - Manual (Page 6)

3. Reinstall battery compartment, cover, and screw.
Install the batteries, camera tube, and micro SD card (optional)
before using product.
When connecting the camera tube to the handheld unit, make sure the keyed
ends are properly aligned. Once they are lined up, finger tighten the knob to
hold the connector in place.
Finger tighten the knurled knob
Engage Camera Tube Plug
and Grip Socket
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