Why would you want to carry a key chain flashlight when you have your phone light?. Because you don’t want to drain your phone battery using it as a light in a power-less situation. Your phone is your lifeline.
MAGLITE ® Solitaire LED Flashlight, new, in its original for Sale! Using only a single AAA battery, its focusing beam is surprisingly bright for such a small flashlight.”. Maglite says Ultra-compact, keychain-ready design : Small enough to attach to a key ring, pocket, or bag so you have light wherever you go.