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The ER 30 laser pointer is a very high quality 5 tip laser pointer. Powered by 3 LR 44 batteries (included). From engraving over-runs or set-ups, these pointers are new, guaranteed to give satisfactory service for one year or we will replace or refund your purchase price, your call. A good bargain for your personal use. Range: Over 2500 Feet Diode: 650 nm diode Class IIIA less than 5mW output Power: 4.5 volts DC The constant battery operation time is 4 to 6 hours. Intermittent operation will stretch the battery life to several weeks or months, depending on the frequency of use.