This is authentic Eleaf i Stick TC40W mod Adopts newly introduced technical element of temperature control 510 Threaded Clear OLED display Accurate reading of resistance: The reading of resistance becomes more accurate with the number down to the second decimal point. Stainless steel threads & spring connector Micro USB (Universal Serial Bus) Charging Port Battery Capacity: 2600m Ah Wattage Range: 1-40W Rated resistance range: 0.05-1ohm (TC mode), 0.15-3.5ohm (VW mode) Temperature range: 100-315?/200-600? (TC mode) How to charge? The battery power indicator on the screen will keep flashing when the remaining power is less than 10%. It can be charged with the USB (Universal Serial Bus) cable through the USB (Universal Serial Bus) port at the bottom. It will take about 3.5 hours to get a full charge via 1A wall adapter. The battery indicator will keep flashing during charging & the screen will go out when fully charged. Brand: i Smoka Eleaf LCD Display: Yes Variable Wattage: Yes Battery Type: Built-in Li-Ion Battery Battery Capacity: 2600m Ah Temperature Control Range: 200-600