The iO-WR wireless relay kit contains 2 four-channel transceivers. The base module has three transmitting channels and one receiving channel. The satellite module has three receiving channels and one transmitting channel. Each transceiver module uses a redundant transmission protocol for failsafe protection. If either module does not receive a valid "ON" or "OFF" transmission signal within 60 s, the output(s) will be turned off.

iO HVAC Controls Wireless Relay, 24 VAC, 2-1/4 in Overall Width, 1 in Overall Depth, 2-1/2 in Overall Height

• Instruction/Installation Manual https://assets.unilogcorp.com/267/ITEM/DOC/iO_HVAC_Controls_WR_Instruction_Installation_Manual.pdf
• Specification Sheet https://assets.unilogcorp.com/267/ITEM/DOC/iO_HVAC_Controls_WR_Specification_Sheet.pdf