2. Telescope Mod is a fully mechanical mod.Custom can match personal vaporizer (no PCB);
3. 510&EGO head work with all kinds of atomizer or cartomizer with 510 thread. venting holes on the bottom are used for security protection in case of the over heating of the battery.
4.Rotate the bottom locking button anti-clockwise to turn off the MOD, and to activate the MOD by rotating it clockwise. The locking bottom button makes this a pocket friendly device.
5.as for the function ,it’s full output of the battery voltage ,no PCB, and there will be no problem even when you put wrong of positive and negative terminals of the battery.