have tried several of these bike indicators and I can say this one is the best,,,,,,,,,, for a start you can with a coin open the controller to replace the battery which you cannot on the others I have tried,,,,,,,,,,,,,,,, very pleased with this model...............
Item only works intermittently - Sometimes lights & control unit do not connect… ☹️
I’ve found that you have to completely remove the battery from the controller & then replace it to somehow ‘reset / resync’ both units… Quite annoying really… 🤔