1；Easy To Install: Some devices require such battery packs, and if purchased separately for use, it can easily cause short circuits and equipment damage 2:Superior Performance:Each battery is tested and then automatically packaged together by a machine, completely cutting off short circuits and reversing for easy use 3:Durable Power: Our batteries have superior capacity to provide long-lasting power for your device. 4:Safety Design:Each battery is packaged inside a blister, which is much safer than buying a battery separately, and children will not easily peel it off. 5:Widely Used:Works with all bore sight laser cartridges which require to stack 3 pieces of AG4 LR626 377 SR626 batteries