Clip-On Book Light Reading Travel Mighty Bright Lot 2. Clip On Book Light. This is a new clip on book light. Great for working, camping, fishing and reading at night. Adjustable clip for any kind of use. Uses Lithium battery that is included. This is portable and can be attached to a desk, hat and book. Shine at any angle by adjusting the arm and lamp shade. It measures approximately 6" x 2 1/4" x 1 3/8" (152 x 57 x 35 mm). Clip On Book Light. This is a new clip on book light. Great for working, camping, fishing and reading at night. Adjustable clip for any kind of use. Uses 2 AA batteries (not included). This is portable and can be attached to a desk, hat or book. Shine at any angle by adjusting the arm and lamp shade. It measures approximately 5 3/4" x 3 1/2" x 15/16" (146 x 89 x 24 mm).