Note the Fenix E05 is smaller, lighter and higher performing (more lumens) than the E01. The E05 is only about $6 more on Amazon. The LD01 outperforms both of these, but is larger and considerably more expensive. However, the LD01 is more than I want to pay for a AAA flashlight. I'd rather just go with a higher performing AA flashlight that's not really for the key chain. (I have the LD10.)