Here is what's new with MKIII: Reverse clicky switch is back Thinner tailcap allows more room for your finger, making the button easier to operate Titanium clip and screws New titanium washer with a keyring loop. comes with a split ring (if you need plain washer without the loop, see the link below description) Bigger inner diameter to support 10440 USB-C batteries Compact size together with a proper pocket clip makes it effortless to carry around. Click switch with a simple UI makes it easy to use in different situations. Quality build and good materials ensure longevity, and all this without breaking the bank. The light source is a Nichia 519a R9080 4000K LED. The light ships with a 350mAh rechargeable 10440 battery. Compact EDC torch Reverse clicky switch Ti clip and screws Comes with the loop washer and split ring