That price if you look carefully is for the extra plastic attachments only, it does not come with the fingerbot. But they are not too badly priced though if you click the other options they will likely be around £12. The other brand (and possibly the orginal) was called SwitchBot so you might want to compare both versions.
EDIT: Also double check that certain versions dont need a hub/gateway, I think the SwitchBot one does but not sure about fingerbot. They also might have different comms versions like wifi, bluetooth and zigbee (which will need a gateway of some sort).
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