Unlike "E.T." in the 1982 Steven Spielberg film, modern-day Japanese fashionistas need only pick up their Android-powered smartphone to set their finger glowing.
Building on the immense popularity of manicure art - where intricate patterns and small gem-like stones are stuck on the nail - toy company Takara Tomy A.R.T.S. has developed a micro-thin LED sticker.
The "LumiDecoNail" uses a technology called Near Field Communication, in which small amounts of power are transferred very short distances, to communicate with a smartphone.
It also flashes whenever the wearer uses an electronic money card such as a train pass.
The product will go on sale in Japan next week, with a set of 16 nail stickers - one of which contains the LED - costing USD 12 and marketed mainly at young people, said company spokeswoman Misayo Aruga.
"I am now wearing it on the middle finger of my right hand. It blinks whenever I pass through train gates, which lifts my heart a bit," she said.
The company will consider marketing the cosmetic product overseas after seeing how consumers in Japan react.