Variable voltage preheating batteries are the IDEAL battery when using THICK extracts, or if you just want to get a better pull than the old buttonless version. Preheating function warms the thick oil before use, just tap the button twice for a 20 second preheat. Battery capacity of 320mah. 

Switch the bottom dial to change the voltage from 3.3/3.8/4.3/4.8V
 

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FAQ

Q: Will u tell me if my order will delay?
A: Yes, we will keep you informed if your order will be delayed by any reason ,everything will be under your control.

Q: Will you push my order if I want them urgently?
A: Yes ,we will confirm delivery time before your order ,but if you need urgently we can arrange your order seperatly.

Q: Are you able to call me if we have too many or complicate things to communicate?
A: Yes ,every sales do English train 3 times a week for this.

Q: How do we place an order?
A: Comfirm product details with us and we will send a PI or set up a order on alibaba ,order confirmed once you finish the payment.

Q: How do we make the payment?
A: We accept T/T wire, alibaba,  Western Union.

Q: Is OEM/ODM available?
A: OEM/ODM is highly welcomed.