This page will help you understand what Items are and what type of effects they have in the game. There are a few ways to obtain Items. Obtain Items from the Login Bonus as you progress through it. You could buy Items from the shop menu. (Note: all Items are purchased with Medal). You can obtain some Items through completion of certain stages.
The maximum Items value is 99
All Items:
Golden Bat: ???
Value Set: "Radar x3""ApLvMax x3""Reward Up x3""Mobile Satellite x3"MSP +50000 P" 5 Item Set available.
Unlock 1: Allows you to unlock all stages in World 1.
Unlock 2: Allows you to unlock all stages in World 2.- Unlock 3: Allows you to unlock all stages in World 3.
- Radar: 100% chance of freeing 1 POW on winning.
- APLvMax: AP speed Lv is at Max from start during battle.
- Reward Up: Battle ending rewards up by 1.5.
- Mobile Satellite: A "Mobile Satellite" is placed up in the air and automatically attack enemy units.
For the price of the Items enter in 
Shop.