All flashlights feature unbreakable plastic lens, positive-action slide switch, switch guard, sure-grip ribbing and convenient spare bulb compartment. Their durable, high-impact plastic cases resist water, oil, grease, alcohol and corrosion. Four models to choose from. General purpose Model 1618 has a 2-way switch, and is yellow in color. Model 1618ML includes a magnet for attaching to metal, leaving hands free for work. Safety Model 2217 is MSHA, UL and CSA-approved due to its built-in circuit breaker…prevents ignition of an explosive atmosphere that can start with a broken " lighted" bulb. It is waterproof, molded in international orange, and has a 3-way switch and ring hanger. Model 451 has a 10" arm extension, which illuminates at end when raised. It has a 3-way switch and ring hanger, and is black in color. All models operate on two D-cell batteries (not included).