Square has a new way for merchants to take your money: a new handheld device. It is called, wait for it, Square Handheld. In April, Square announced it was smashing all of its various services into a single point-of-sale app. The Square Handheld is another effort to further synergize those capabilities, packing everything into a slim device that can also process payments directly via a card reader. The Square handheld is half an inch thick, weighs less than three quarters of a pound, and connects wirelessly to the Square system.