Replacement batteries for your LED Light Up Pasties. 

Compatible Names: DL927, DL927B, BR927, BR927-1W, CR279-1W, LM927, 5011LC, ECR927, KCR927

These are small electronic batteries usually found in calculators and most stores like Walgreens, CVS, Kmart and the like carry them. 

*package may vary from picture.