1: There is power lock and wattage changing buttons, pushing both buttons at a time will lock the wattage unless you unscrew the battery or clear lock by self.
2: Firing switch is known as Trigger action which is very convenient to use also it is very comfortable as compare to all ecig devices in market, it gives light physical feel and broad array of comfortable firing positions.
3: ZEN ZNA has battery monitoring system which ensures the safer vaporing and best experience for new and old users.
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