Shimano DEORE LX Dual Control Shift-Brake Levers for V-Brake ST-M580. Let's you shift gears up or down regardless of your hand position on the handlebar.
Shimano Deore LX ST-M580 Right 9-speed Brake Lever Gear Shifter Combination - | eBay
Shimano LX M580 3x9 Front Derailleur - Cambria Bike
Deore LX ST-M580 Dual control Shifters Shifter integrated Shift/Brake Lever 3*9 27 speeds for MTB bicycle bike part - AliExpress Sports & Entertainment