index.js
function SmD(ms_per_unit, range) {
  this.ms_per_unit = ms_per_unit;
  this.range = range;
  this.range_in_ms = ms_per_unit * range;
}
function SmD(ms_per_unit, range) {
  this.ms_per_unit = ms_per_unit;
  this.range = range;
  this.range_in_ms = ms_per_unit * range;
}
function SmD ( ms_per_unit , range ) { this . ms_per_unit = ms_per_unit ; this . range = range ; this . range_in_ms = ms_per_unit * range ; }
Create a smd

@param {String} name
@return {Type}
@api public
Create a smd