These electric lemon slices flash lights in various colors. Barstuff Direct says that they’re handy for identifying your drink in the dark. Though it would have to be really dark bar to have that problem! Available in assorted colours, simply clip to the side of your glass and choose from 3 settings to easily identify your glass in the dark!! Reusable and freezable. They are 5 cms in diameter and weigh over 200 grams. Available for £10 (US$ 14). Via – Strangenewproducts