var MODELS = {
  'SM-R3810': 'gear2neo',
  'SM-V700': 'gear1',
  'SM-R380': 'gear2',
  'GT-V770': 'gears',
  'Emulator': 'emulator'
};

var gear;

tizen.systeminfo.getPropertyValue('BUILD', function (info) {
  for (var model in MODELS) {
    if (info.model.indexOf(model) !== -1) {
      gear = MODELS[model];
      break;
    }
  }
  
  alert(gear);
});