HQRP 4-Pack Coin Lithium Battery for Bushnell First Strike Reflex Red Dot Sight 730005 AR730005 AR730005C TRS-25 + Coaster HQRP&reg; Four Lithium Batteries plus HQRP&reg; Coaster; Battery Voltage: 3V; Each lasts 1-3 months; 60 Days warranty!