Freemax Onnix 20W Kit is able to support both RDL & MTL vaping needs with Dual Airflow Mechanism with OX Mesh Coil 0.5ohm and OX DVC Coil 1.0ohm for options, however, Onnix 2 15W Pod System is born for high strength MTL vaping needs with OX DVC Coil 0.8ohm & 1.0ohm & 1.2ohm available. But OX Mesh Coil 0.5ohm and OX DVC Coil 1.0ohm originally for Onnix 20W and OX DVC Coil 0.8ohm & 1.0ohm originally for Onnix 2 15W can be compatible with both Onnix 20W and Onnix 2 Pod System Kit. How many types of vape coils can be compatible with both Onnix 20W and Onnix 2 Pod System Kit? Freemax OX DVC Coil 0.8ohm (Included in the kit) Dual Vertical Coil and Tea Fiber Cotton Formula Output Power: 12W-15W For High Strength MTL Vaping Needs (20-35mg Nic Salt/3-9mg Freebase Best) Freemax OX DVC Coil 1.0ohm (Included in the kit) Dual Vertical Coil and Tea Fiber Cotton Formula Output Power: 9W-13W For High Strength MTL Vaping Needs (30-50mg Nic Salt/6-12mg Freebase Best) Freemax OX DVC Coil 1.2ohm (Sold Separately) Dual Vertical Coil and Tea Fiber Cotton Formula Output Power: 9W-13W For High Strength MTL Vaping Needs (30-50mg Nic Salt/6-12mg Freebase Best) Freemax OX Mesh Coil 0.5ohm (Sold Separately) SS904L Mesh Coil and Tea Fiber Cotton Formula Output Power: 16W-20W For RDL Vaping Needs (3-6mg Freebase Best)