The YiHi SX Mini M-Class 60W TC Box Mod reaches its true potential with the SX350J chip allowing for temperature control and all perfectly packed into the new, sturdier body. The M Class represents an updated and improved body with attention to details such as surface finish, ergonomics, and the much anticipated Temperature Limiting J Chip. YiHi truly upped their game with this monster of a mod which still uses a single 18650 battery, boasts a maximum 60 watts of power, utilizes the Soft/Standard/Powerful modes. The M Class allows for operation in Power or Joule modes. You can use standard Kanthal coils and set the wattage as with any regulated mod while in Power mode, or with nickel wire (Ni200) builds in Joules mode, you can set the max temperature to allow for long draws with no dry hits.