Luna Mate twist grip throttle
I used this on my Lunamate Bafang BBHD 1KW fitted to an old Marin Nail Trail MTB. Fitting took less than an hour and I find it much easier to use that the thumb trigger I'd been using for a year since I built the ebike. Great value for money. Note that I have only used the bike on the road and have ridden motorbikes for years so YMMV.