Spring connector and stainless steel thread: The spring connection base ensures its great adaptability and the connecting thread is made of stainless steel.
Side Charging Port: The USB charging port is on the side of battery which is more convenient.
Advantages of SUB-40 Series: OLED display, adjustable voltage/wattage and arrow button lock function.
Recomended for SUB-HERB and BRAIN FOGGER
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