The Vindicator 21 (25mm) Mech Mod By Kennedy EnterprisesThe Vindicator By Kennedy Enterprises is a 21700/20700 Battery mechanical mod, it features a hybrid top cap which allows a direct connection to your battery. This direct contact provides one the lowest voltage drop of any mech mod on the market. Kennedy products are MADE IN THE USA and backed by a lifetime warranty! Product Features: 21700/20700 Battery Mod (battery not included) 25mm Outer Diameter Holds 21700 and 20700 batteries Now comes with dragon button Two position full Copper switch for maximum conductivity Constant Contact button  Large vents for safety ADVANCED USERS ONLY - This is a mechanical device which is only suited for users with advanced knowledge of coils, builds, and ohms law.