This 24-Channel Relay board offers a modular USB interfaced that may be replaced with Digi XBee modules, including ZigBee 802.15.4 and well as various Digi Wireless mesh protocols. We also offer Ethernet, WiFi, Bluetooth, RS-232, and other communication options. This controller features 8 Channels of 8/10-Bit ADCs for sensor monitoring applications. ProXR controllers are expandable, allowing control of more relays as your application requirements grow.