This shifter is designed for e-bikes so that you don't shift too many gears at once which can lead to chains snapping due to the increased force produced by e-bikes.
However this shifter will work with any Eagle derailleur and can be used on normal bike too.
SPECIFICATIONS:
Speeds: 12
Compat - Derailleur/Hub (SL): RD:12s
Cable pull ratio: X-actuation
Color (SL): Black
Cable length (SL): 2200mm
Shifter type: Trigger
Matchmaker compatible: Yes
Clamp included?: Yes
Max upshifts: 1
Pull lever adjust: No
Multi-position: Yes
Gear indication: No