Gear

Gear is used to upgrade the gear level of heroes.

There are 5 different Gear levels and upgrading the gear level will unlock the skillset of your hero.

Upgrading the gear level will also give your hero a slight stats increase.

There are four different kinds of gears for each colour for each level making a total of 80 different Gears.

Gears can be optained in multiple ways:

Complete Gear Packs
Complete gear packs are items you usually get from the daily login bonus.

There are 5 different levels of Complete gear packs (Lv. 1,2,3,4,5) and they will give u one of each different gear of that level. So one package will give you 16 gears.

Slot Machine
The Slot Machine also has a change to give you some random gears as a spin reward, although this is very random and not a reliable way to obtain different gears.

Explore
Exploring the wasteland gives you a chance to find a certain gear based on the stage and floor you are exploring on.

Normal stages will give you 1 gear and Elite stages will give you 2. (although some stages have 2 gears in the possible rewards so you could possibly get 2 or 4 gears at once, this only applies to the lower stages though)

Different Gears and where to obtain them
Bio

EMP Heat

Ice