it detects the distance from the nozzle to bed and then adjust Z axis height in real time while printing first layer.
it's not like normal autobed sensor BLTOUCH or other proximity sensor, also no need to do probe points before printing.
Operating Range:10mm
Distance Resolution:0.01mm
Repeatability:+/- 0.005mm
the new hardware and shell as shown in bellowing picture will come soon.
Very cool! I will have to upgrade my printer when it comes out.