Product dimension: the portable key ring light torches measure approx. 70 x 18 mm/ 2.7 x 0.7 inches and the key chains are about 5 cm/ 2 inches long, they are small and lightweight, allowing you to put them into pockets, bags, backpacks and more.Convenient to use: firstly unscrew the flashlight and take out the small round slice inside before using, then press the top button to turn on and off the mini LED flashlight, which is convenient to use and carry around.