1.Clearly marked voltage setting that you will not need a magnifying glass to see.
2.3.3v to 4.8v smooth turning voltage adjustment dial.
3.Short Circuit protection
4.Click on off button
5.Works with 510 and EGO gear.
6.Vision Battery 400mah,650mah,900mah,1100mah,1300mah
7.Charge With any USB eGo Charger