Main function: Charge and sync. 1. Extremely portable keychain design, attaches directly on your keychain with the rest of your keys, very convenient to carry. 2. Self-locking system ensures it doesn't slip off your keychain and protects micro USB connector when it's not in use. 3. Discreet and solidly construction of a durable flexible plastic. 4. Connect your mobile phone with micro USB connector to your computer for syncing and charging. 5. Power adapter for convenient charging from a wall outlet.