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The causes and propagation of block updates are different between ''Java Edition'' and ''Bedrock Edition''. As a result, each can detect some kinds of changes that the other cannot. See the table below for a comparison.
When it detects something, the observer emits a [[redstone pulse]] of [[Redstone circuit#Power|strong power]] at
In ''Java Edition'', the pulse is emitted with a delay of 2 game ticks (1 redstone tick). In ''Bedrock Edition'', it is supposed to be delayed by
Observers also emit a pulse after getting moved by [[pistons]]: this enables them to be used in [[flying machines]]. {{IN|JE}}, however, moving an observer that is currently emitting a redstone signal will cause it to turn off instead.
Observers behave as both opaque and transparent blocks: they block light and allow mob spawning on top, but do not block opening chests below
Because observers in ''Java Edition'' react to shape updates, they can detect some changes that a [[block update detector]] (BUD) would be unresponsive to, as opposed to ''Bedrock Edition'' where observers detect the exact same updates that any other BUD would detect.
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