Each emoji comes with a sticker style edge and without as well as black and white. They are approx 900x900px in size (3inches x 3 inches) and can be resized no worries.
Import into your editing program such as PowerPoint, to create lots of fun stuff including posters, worksheets, layouts and other teaching resources.
Here are the 2 sets of Emojis that are available in my stores, links underneath to TpT, link to ETSY in sidebar.
FREEBIES in my TpT store..... links under images....