HAC-UM96 Sleep Mode?

Do these units have the sleep mode enabled?

These are a perfect fit for a need I have for a device with a 600 foot range that performs regular, periodic updates. But since it will be battery powered with a solar charger, I really need a low current sleep state.

I was about to order a couple of RF-24Gs and hope I could get the needed range out of them but this would be a much better fit.

Jerry