Specification: Size: 25mm x 87mm Battery Type: Single 18650 Battery (not included) Thread: Hybrid 510 Thread Cpntact Pin: Gold Plated Switch: Include Magnet or Spring Fire Button: Include Stainless Steel or Acrylic Material: Brass Package Contents: 1 x DEJAVU DJV Mech MOD 1 x Alloy Knurling Sleeve (Assembled) 1 x Polyacetal Sleeve 1 x Spring (Assembled) 1 x Magnet 1 x DJV Camouflage Bag 2 x Stickers 1 x Accessories Pack The DEJAVU DJV Mech MOD is designed in Malaysia by the Youtube reviewer Adrian Lo Dejavu. Powered by single 18650 battery, the DJV Mech MOD can work efficiently with the available two types of button, the stainless steel or acrylics. And the DEJAVU DJV also features the innovative hybrid system, which allows most atomizer\'s 510 pin to contact the battery directly for better power transfer and a harder, faster hit. Together with the advanced canted coil inside the gold plated contact pin, the DEJAVU DJV Mech MOD can supply maximum firing and reduce heat effectively. Plus the optional spring and magnetic switch, it will be very easy to operate the DEJAVU DJV with different hand feel.