Light-fingered

False fingernails that glow when you use your cellphone have been developed
in Japan. The optical nails—called optils—are aimed at teenagers who
want to look cool while phoning their friends, according to The Nikkei
Weekly. A red or blue LED in the tip of the stick-on nail has a short
antenna hidden inside it. When the cellphone is in use, the antenna’s
electromagnetic field induces enough current to light up the LED. The
manufacturer, Sunshine of Ube, sells one optil and 11 standard false nails for
£21.