Flurry of Blows is a 
Bonus action that allows the Monk to deal two unarmed strikes at their opponent.
Description
Bonus action. Deal two Unarmed Attacks. Can be used at any moment, it does not have to follow a regular attack.
Properties
Bonus action + 
1 Ki Point
Attack roll- Damage: 1 + Strength Modifier
Bludgeoning (minimum 1 damage) 
Range: 1.5 m / 5 ft