ADONYX Bicycle Brake Levers Shifter LITEONE 3x7 21 Speed Shifter with Gear Indicator Bicycle Brake Disk

3x7 SPEED: You can use only left gear shifter for 3 speed and only right shifter for 7 speed and both left and right shifter for 3x7 speed. Optical Gear Display Indicator: All shifter come with wires, with noise-dampening bumper stopper, offering precise and consistent shifting performance. Designed with optical gear display indicator to show you the gear position Trigger Type Handle: Right shifter is a trigger-type 7 speed shifter, with one lever for down-shifts and a thumb button for up-shifts. Left shifter is a ratcheting thumb lever for triple cranksets. Ergonomic Design: Compatible with liner-pull, cantilever, roller, and mechanical disc brakes, Ergonomic design for more comfortable operation HIGH QUALITY MATERIAL: This Thumb Gear Shifter is made of durable aluminum alloy material, it works perfectly for optimum performance and maximum safety and longevity.