fit for ego-c atomizer ,ego-T atomizer ,510,510-T , ce2,ce4 fit for all kinds of atomizer it have three voltage,3.2V/3.7V/4.2 fit for ego-c atomizer ,ego-T atomizer ,510,510-T , ce2,ce4 fit for all kinds of atomizer it have three voltage,3.2V/3.7V/4.2V.Five pressing button will change the voltage. Remember that you need to connect this with computer,than it start work. electronic cigarette