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. 5 Click on off button. 5. Works with 510 and EGO gear. 6. Vision Battery 650mah, 900mah,1100mah,1300mah. 7. Charge With any USB eGo Charger.