http://www.innokin.com/itaste-vtr.html 
  
  
  
Features in Brief: 
Variable Voltage: 3.0 – 6.0 volts 
Variable Wattage: 3.0 – 15.0 W 
Short Circuit Protection; 
RMS (root mean square); 
Reverse Battery Protection Circuit; 
Resistive Load Detection (Ohms meter); 
ON/OFF battery switch; 
LED Battery Power Display; 
Low Voltage Warning; 
Overtime Vaping Warning (10 second switch cutoff); 
Battery safety protection (Vent holes); 
High compatibility 510/eGo connector: 
Built-in 3 digit display (Ohms meter, Volts /Watts, Atomizer voltage output) 
Replaceable Battery: iTaste VTR supports 18650 batteries (unprotected)