SRAM
SX Eagle Single Click 12-Speed Rear Trigger Shifter With Discrete Clamp Black A1

Ensure drivetrain durability with the single click shifter option designed for E-MTB use.

Things to remember:

E-MTB specific Eagle™ shifter option limiting the pull lever to a single engagement.
Specifications
Speeds: 12
Compat - Derailleur/Hub (SL): RD:12s
Cable pull ratio: X-actuation
Cable length (SL): 2200mm
Shifter type: Trigger
Matchmaker compatible: No
Clamp included?: Yes
Max upshifts: 1
Pull lever adjust: No
Multi-position: No
Gear indication: No