Yeah it’s ant+
Also, to calibrate it (although it was pretty spot on) you need an android phone as there’s not an apple app. It involves hanging a 10kg weight off the pedal.
I’ve just got the lifeline ant+ mini stick from wiggle £20, worked fine, even with laptop on a worktop in front of the bike wheel (couldn’t put wheel under it as there were cupboards). It’s range was fine, never had any dropouts.