2.63" overall. Clip. Rechargeable. Water resistant. Each light is hand finished. CREE G3 LED light and orange peel reflector. Glow in the dark diffuser and front o-ring. Twist-head switch for three brightness levels. Low (5 lumens), Medium (65 lumens), and High (180 lumens). Lens has been treated with anti-reflective coating. Circuit is reverse polarity protected. Do not use high voltage rechargeable batteries. Spare O-ring. Requires (1) AAA battery (not included). Copper construction. Bulk packed.