Flash Sticker for Universal Mobile Phone. Use 1x3V button cell. Suitable for GSM/TDMA/CDMA/PHS/PCS mobile phones Sticker flashes when making or incoming a call Available LED lamp color: red, green, orange,2-6 LEDs lamp can be built inside the flash sticker Custom logo and imprint can be printed on the flash sticker and paper card for promotional purpose. OEM designs are welcome