Mini Rechargeable Clip-on Reading Light for Books in Bed, 14 LED Blue Light Filtered Book Light, 3 Colour Modes & 10 Brightness Levels, Perfect for Bookworms, Kids & Travel The lighting area is 14 LED more than that of ordinary LED light. Long press to change colour temperature, long press "+""-" change brightness level too .The clamp is steady and sturdy. The max opening height is 1.8 inches and it is easy to clip on up to 1 inch thick book. Flexible anti-slip pad equipped. The weight of the book light is only 2.22 oz. It is small, lightweight and compact enough to throw in your purse.