Overdrive Unit 
is a passive module that boosts a robot's overall firepower. While a robot's durability is below a critical level, all weapons have increased damage. If a robot has several modules of this type, the damage bonuses are combined, and the critical durability threshold is increased.
Note: if the robot's durability gets repaired and exceeds the activation threshold, the module will deactivate until the durability is below the threshold again.