In game description:
"Place this device and anybody can watch it to see if you are online! Or alive. Note: it can't actually tell if you're alive. But it will beep if you are online!"
This item can't be spliced.
This item never drops any seeds.
This item can't be destroyed - smashing it will return it to your backpack if you have room!
This item can be placed in two directions, depending on your facing.
Heart Monitor
Surgical Kit
This item can only be obtained by purchasing the Surgical Kit for 8,000 Gems or Get it from trade with other people.
Additional Info
The red light will blink if the owner of the Heart Monitor is online. Standing on the Heart Monitor will bring up a text bubble saying "[Username] Status: Online/Offline"