This is an ultimate (free) collection of the most used devices for Wireframing inside single Sketch file. This is going to save you time and it will help you to impress your clients with great looking wireframes!
It's an 12.9 inch model at 1/3 of the original pixel resolution for a smoother transition to real pixels. Includes an Apple Pencil. Available in landscape and portrait. Its all symbols so you can configure it however you'd like.