With the exception of its interior specifications and Mobitec EDS, SMRT Buses' Enviro500 MMC 12m double-decker buses are mechanically similar to its Hong Kong counterparts - they are powered by the Cummins ISL8.9e5340B engine (8849cc) which is Euro V compliant and fitted with ZF EcoLife 6AP1700B 6-speed automatic transmission. Air-conditioning was supplied by Denso.
This New Generation model is an evolution of the original Transbus/Alexander-Dennis Enviro500, which in turn was the direct successor to the Dennis Trident 3 which SBS Transit previously operated a small fleet. The Enviro500 MMC, Enviro500 and Dennis Trident are very popular models for major public bus operators in Hong Kong.
A 3-door 13m prototype was constructed for LTA as its concept bus entry. Although it has not manifested as a fully functional demonstrator, it led to Alexander-Dennis winning a contract from LTA to deliver a production batch in the near future.