The easiest way to tell is to look at the LTA seal attached to the Powered Assisted Bicycle (ebike). Each seal has a LTA logo and unique identification number which can be identified and verified to LTA database.
Starting February 2016, only gold/orange LTA sealed is allowed to be type-approved. This new gold standard has more stringent safety standard than the blue seal which is already phased out.
However, getting type approved is one thing but the most important thing any prospective of PAB/ebike buyer should know is that; has the approved PAB/ebike been successfully registered with LTA?
Only LTA-registered PAB/ebike is 100% legal to use in Singapore!
Should one need to know what are the process of getting a type-approval and how to get it registered after the approval, read the article here.