I have not kept up to date with recent devices, but have just bought 4 of the above and tried to pair them. They are recognised, but the resulting menu is nothing like what I have on previous devices and does not offer off/on.
Is there a special procedure for pairing these switches?
If you compare the Zigbee Device Details are there any differences?
If Sonoff has come out with a new version using a different fingerprint, you might need to change the Driver. 
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Info here that should help...
