This is a Renata watch battery #392 (SR41W) This battery is commonly required for Swatch, Fossil, Timex and Casio popular brands Renata has first hand knowledge of what a high quality watch battery must stand for Optimized volume/capacity ratio Dimensional precision and stability High capacity retention on storage (low self-discharge) Excellent reliability thanks to a uniformly high quality level State of the art leakproofness thanks to a sophisticated sealing process Renata's professional expertise is worth having on your side and in your watches