Your penalties on attack rolls for fighting with two weapons are reduced. The penalty for your primary hand lessens by 2 and the one for your off hand lessens by 6.
If you have base attack bonus of +6 or higher, you can make a second additional attack with your off-hand at -5 penalty.
If you have base attack bonus of +11 or higher, you can make a third additional attack with your off-hand at -10 penalty.
If you have base attack bonus of +16 or higher, you can make a fourth additional attack with your off-hand at -15 penalty.
A 2nd-level ranger who has chosen the two-weapon combat style is treated as having Two-Weapon Fighting, even if he does not have the prerequisite for it, but only when he is wearing light or no armor.