The U4 (G2) has two improvements based on the original U4 carabiner knife,
1)With a blade safety lock; 

2) The carabiner body is unibody which adds strength and durability to the carabiner itself. And the blade uses a standard #11 scalpel blade (5 extra included) for easy and simple replacement.
Tools the U4 (G2) could be used for,
We ship to most countries from Hong Kong using Fedex / S.F. Express. For Oversea orders usually arrive around a week. You will be able to see the shipping rate at check out page. Please contact us if you have any questions.