2 in 1 Invisible Writer $14.99 Default Title - $14.99 Quantity This product is coming soon. Please fill in the form below if you'd like to pre-order this item! The IQ Invisible Writer 2-in-1 Pen lets kids write messages and then reveal them with the attached black light! Great for top secret info, the pen comes with black ink too. Recommended for ages 3 years+. Requires three AG10 batteries, included.