Free your hands from holding the book. It is a versatile and most reliable reading aid. Help reader overcome the reading problems such as neck pain, sore back, shortsighted, ect. The distance sensor will flash a warning light or start a buzzer to keep distance when the readers' eyes are less than 30cm from the book. It has combined an innovative patented design and the unique properties of polypropylene plastic. Adjustable to fit books of different size up to A4 Versatile-holds text books, computer manuals, cook books, etc. Adjustable to fit books of different size up to A4, and it can be adjusted to some positions materials at several different angles, 70°, 65°, 30°, 15° Durable–absorbs impacts that crack more brittle plastics Strong-supports the heaviest books and manuals Portable-closes to the size of a legal pad Easy of Us -sets-up in just seconds