Instinctive Activation; Front. Rugged Hard Polymer. Ultra-compact 3.3mm Diode. Both Windage and Elevation. 3 Years Complete warranty. 5mw peak, 633nm, class IIIa laser. Maximum output that federal law and technology allow. Approximately 0.5" diameter at 50 feet. Either two #357 silver oxide batteries or a single 1/3N 3 volt lithium battery.