e+ IS former Tidal Force which I got 18,050 km on my original CATEYE COMPUTER.
It is rock reliable, I ride rain , mkinus 15c MAX, you name it.
Controller is built into motor housing, brand is E+ one of the kind, not sold under any other name , t6hat's Chiunese spaciality to sell rebadged stuff.
After Wavecrest stopped making Tforce bike technology was sold to Europe but former engiineers in USA started their own company EMS which manufacture improved version of TF here in Washington state.
MC