This ultra-slim, flexible keypad is an electronic dictionary with over 130,000 words with definitions. Plus, it's a bookmark. The unique keypad clip helps keep it in place as it sits neatly between the pages of any book. It is also a multi-function calculator; the internal clock keeps the time and date and the handy conversion function is great for converting temperature, weight, length, etc. Large LCD screen allows easy reading. Uses one CR2032 lithium battery (included). Measures 5¾"h x 3½"w.