... , 2pcs CR2016 cell batteries included dimensions: 60*24*7mm ABS plastic body, painted surface,good looks and good feelings,2pcs CR2016 ... easy to be carried together with you keys.It is great idea for gift and dailyuse LED flat keychainIt is very light ... LED, optional color: white, blue, green, RGB (full color changing) or UV light for detecting the fluorescent symbol in bank note.plastic ...