SEDs of the class I VLM objects ([GKH94] 41: brown line, IRAS 04191+1523AB: red line) and previously reported class 0 proto-BDs: L328-IRS Lee et al. (2013; blue line) and IC348-SMM2E Palau et al. (2014; violet line). For [GKH94] 41 and IRAS 04191+1523AB, infrared to submm data are taken from Bulger et al. (2014) and references therein. The mm data measured in this paper are indicated by the open and solid stars for IRAS 04191+1523AB and [GKH94] 41, respectively. The brown dashed line shows the best fit for a modified blackbody of the dust envelope of [GKH94] 41 and the red dash-dotted line for IRAS 04191+1523AB.