Small, convenient, easy to use. Fits on your key chain. Simply insert edge of bill and squeeze. Marks denominations of 1, 5,10 ,20, 50 and 100 dollars in braille for easy identification. 3-1/8 x 1-1/2 Inches. Chain Included. Product dimensions (imperial): 3.125 inch L x 1.5 inch W Product dimensions (metric): 79.38 mm L x 38.10 mm W