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Mobile flashing stickers powered by RF from your phone (no batteries) : https://www.alibaba.com/product-detail/GSM-mobile-led-flashing-sticker_521197206.html ht
by vincnetas 10y ago
Mobile flashing stickers powered by RF from your phone (no batteries) : https://www.alibaba.com/product-detail/GSM-mobile-led-flashing-sticker_521197206.html https://www.alibaba.com/product-detail/GSM-mobile-led-flashi...
[EDIT] http://electronics.stackexchange.com/questions/38838/powering-an-led-from-rf-cellphone-signals http://electronics.stackexchange.com/questions/38838/powerin...
- greggman 10y agoThose stickers are cool. Japan had various dangly things to attach to your feature phone that worked similarly for years. Smartphones generally have no place to attach anything so they seem to have mostly disappeared.