This wrist-mounted gadget can be activated as an action on your turn, firing out a reinforced cable onto a target surface within 50 feet of you. When you do, make a Dexterity check. You can add your proficiency bonus to this roll if you have proficiency with one of the following: Tinker's Tools, Thieves' Tools, or Mason's Tools. On a result equal to or higher than the structure's AC, the cable latches itself to the specified point, allowing you to swing across gaps or climb steep walls. You can have the cable detach itself from a surface as a bonus action, returning it to your device. 

Additionally, you may recall the cable without detaching it, pulling you towards the targeted surface before tracking completely. If the targeted surface is a Medium or smaller object, it is pulled towards you instead. If it is a Medium or smaller creature, they must make a Strength saving throw (DC 8 + your proficiency bonus + your Strength modifier), being pulled towards you on a failed save or pulling you towards them on a successful one.