Smaller than most of the keys in your pocket when folded away and weighing even less
This Keychain Lets You Charge Your Phone With A 9-Volt Battery
— Kerry Flynn - The Huffington Post
If your phone dies or gets too low on juice, you whip out the Plan V and attach it to a 9-volt battery
— Adam Williams - Gizmag
The Plan V is small enough to hang on your keychain, making it an ideal emergency agent
— Bastiaan Vroegop - iculture