You can use this adapter to replace a PX640 battery (PX640 / EPX640 / V640PX / H-N / E640N / MR52 / NR52 / 1126MP) with a 1.5V LR44 (A76 / KA76 / V13GA / AG13 / D76A / S76 / PX76A / L1154 or SR44W (D357 , KS76 , V303 , V313 , V357 , V541 , EXP76 , D357H, V76PX), to be used in the Yashica Electro 35 FN or other cameras..Canon Canodate E, Canodate E-N, Date-Matic,.Fuji Fujica GE, Fujica GER, Fijica GA, Fijica Date,.Minolta Hi-Matic E, Hi-Matic F,.Olympus 35EC, 35EC2, 35ECR, 35ED,.Ricoh 500GX. 35EFS, ELNICA 35, ELNICA F,.Yashica TL-Electro, Electro 35 FC, Lynx 14-E and Lynx 5000E..ø 16 mm.height 11.2 mm..The battery fits snuggly, and can be removed using the side access hole. You will receive one adapter. The battery is shown as an example and is not included. ..Please note that due to the nature of 3d-printing and the fact that I might be updating the design, the adapter you receive might have small imperfections and look slightly different (also in colour).