The one on the first video is the one I bought. Not compatible with trains that use smaller batteries, although you can buy a Mr Motorman motorized carriage for those units (which is what I did, even tho it looks pretty despot). It can, in fact, control three different remote units, which is nice (although I only have the one remote unit...thought the motorized carriage came with one, but it didn't, boo). Looks easy to set up too.