EL wire is ligth soruce Call-in reminder by quickly flash,good for disco,party,holiday, Christmas,Halloween and Easter 3. ... "EL wire is light sourceColor:Pink/Orange/Blue/Lime greenFunction:Flash and telephone call reminder by quickly flashPower:CR2032 Batteryx1pcs(=3VDC ... long to 8 hours (Tested with Duracell battery)Length of bracelet is adjustable from 19CM-24CMUsing in the disco, party, Holiday ...