This model throttle was fitted to all e20, Vista, eMetro, Essence, eCity and eUrban models from 2014+. Classic product with a marine grade 'Julet' 3 pin male YELLOW connector plug.
Normally plugs into a 'wiring harness'. Can be interchanged with some 'thumb throttle' variants.
Our experience has taught us that regular uses tend to break these every 2 or so years: normally from hitting things or general aging agents. Normally wise to have a spare.
The term 'half-throttle' is opposed to a 'full-length' throttle as it was intended to still have a portion of regular hand grip on the handlebar to force more deliberate action.