Not sure if it's necessarily better. The Lilly also requires a tag to work, but it can only handle 20 minutes of battery with no way to insert a backup. This is

Not sure if it's necessarily better. The Lilly also requires a tag to work, but it can only handle 20 minutes of battery with no way to insert a backup. This is relatively low-tech and seems to be capable of enhancing your existing hardware, rather than replacing it. That's a big win. Still, the Lilly is really cool.