This wrist-mounted gadget can be activated as an action by making a ranged attack with proficiency onto a target surface or creature within 40 feet of you. If the result equals the targets ac or higher, the cable latches itself to the specified point, allowing you to swing across gaps or possible climb steep walls. You can have the cable detach itself from the contact as a bonus action, returning it to your device.

Alternatively you can pull yourself to the target pulling you to the surface before retracting completely. If the target is a medium or smaller object it is pulled towards you instead. If the target is a medium or smaller creature they must make a strength save of 13 or higher or be pulled towards you on a failed save or pulling you towards them on a successful one.
Attempting to do this on a large or larger creature pulls you towards it.