1. Copper positive pin and swith( Lowest contact resistance, lower voltage drop)
2. Comes with 3 tubes (18650, 18500, 18350)
3. Upgrade the swith.
4. Short throw recessed bottom switch design.
5. 20 X 1 threading tube.
Features:
1. Advanced bottom lockable button
2. Copper positive electrode and switch.
3. All Stainless Steel(Copper positive electrode and switch)
4. High quality version
5. Recessed button
http://www.desire-ecig.com/Giant-Pulse-Style-MOD-V2