Originally Posted by njkayaker

This wouldn't be a good design for sensors generally.

Multiple head units can read the same sensor data (I do it and so do some tandem riders).

Acknowledging the head units would require the sensor to keep track of more than one head unit. And, if an acknowledgement failed to occur, it's not clear what the sensor could do that was useful (retransmit the data? for how long?). It would just make the sensor more complicated for no good reason (for a situation that can easily tolerate a bit of data loss).