Varta Professional CR-P2 6v. Lithium battery with high capacity. The battery is widely used in cameras, smoke detectors etc. Equivalent in other brands: DL-223A, EL-223AP, K223LA, CRP2, CRP2P, PC223, 5024LC, CR17-33, CRP2S, PC223A, VL223, CR-V6/P, BR-P2.