5” overall. Clip. Water resistant. Impact resistant. Rechargeable. Able to illuminate writing in the dark. 2-in-1 that can be separated into independent parts. USB charging cable. Ink refill. Modes: High (120 lumens, 20m runtime); Medium (60 lumens, 50m runtime); Low (20 lumens, 2h 20m runtime); Moon (5 lumens, 10h runtime). Requires (1) Lithium battery (included). Aluminum construction. Color: Black. Boxed.