The IDEC product accepts 24 VDC input voltage; has fixed repsonse times of 12 ms ON & 10 ms OFF; has common input wiring and has 16 channels. The Macromatic product accepts 102-132 VAC & 10-125 VDC input voltage; has a selectable response time of 0 or 2 seconds; has isolated input wiring and has 4 channels.