1) Green product, healthy product, no nicotine. 2) Protable and low cost Each cartridge keeps: 400puffs,equal to 2 packages real cigarette. Battery capacity : 250mAH,3.7V . Times of charging up: 500times . Time of charging up : 2 hours . Input voltage(1): USB 5V ,USB port can be hide. Input voltage(2): AC charger AC100V-240V Dimension: F9*104mm.