@ogiewon, ah-yup, pretty sure that's the case (just checked). This thing is forged out of 99% pure Chinesium and needs a custom driver/DTH.
I was initially going with the built-in generic zigbee switch driver, however just had a brainwave and searched for the SA-003 model number - a few rabbitholes down I came across a custom driver which @Royski made/modified. (and 1000 karma points to you, sir!) (post here)
I just installed it a few min ago and gave it a whirl and whaddayaknow, instant update!
I'm going to test further, but so far it looks real good.