The maximum number of zones you can have on an Omni IIe is 48 (16 Onboard, 2x Hardwired Expanders or 1x Hardwired Expander and 1x Wireless Receiver). The 64-zone wireless reciever will report to up to 16 zones on the IIe. You can however learn multiple devices in each zone for up to the total of 64 devices.