Features of Chiyou mod:

1. No PCB board to avoid short circuit and breakdown,more durable.

2. Material  by copper  and pins parts are made by copper as well

3. safety mechanicl switch on/off in the bottom.

4. Extend battery cup, it can be match with the  battery 18650, 18350 and 18500.

5. Airflow control and lock function.

6. No ash, no unpleasant smell, only vapor

7. Cheaper than traditional cigarettes, and social ecognition is higher

8. Don't let others suffer the hazards of passive smoking