The CMR-209 Rail Master® Universal Pistol Light for rail-equipped firearms, a versatile tactical lighting option at an incredible value - from the brand you trust for personal protection optics. - Instant Activation™: Tap-On / Tap-Off - 200 Peak Lumens LED White Light - Material: Polymer - Water Resistant (IPX4)Impact resistance up to 1 meter - Modes: On/Off • Momentary - Battery life: 1 hr 30 min - Weight: 1.98 oz with battery installed Fits most pistols with M1913 Picatinny (or similar) accessory rail measuring at least 1" from recoil lug to trigger guard.