Features: 1) YP-100: a) Servo air temperature control by micro-computer b) Quiet operation windows c) Touched operation panel d) Front door of hood may open up e) LED digital display f) Set temp. and real temp. displayed separately g) Five alarm functions2) YP-100A: a) Based on YP-100 b) Added with side door which may pull out mattress from the side, convenient for scalp injection3) YP-100B: a) Based on YP-100 b) Added with one phototherapy unit with blue light c) Timer records tube used time4) YP-100AB: has all functions of YP-100A and YP-100B