Product details:

Small enough to fit on your keychain, this emergency power bank stays by your side when you're on-the-go -- keeping all your portable devices charged and ready when you need them. And with a bonus bank, there's a backup to keep your batteries boosted. The TAU's magnetic charging dock fixes onto a counter or wall easily, making it effortless to recharge your power back. Just hang your keys on the dock when you get home and the TAU will be ready to go when you head out next! The integrated cables mean that you can be ready to charge any device at any time. From TAU.