TENS neck massager (great)

official name : Smart Neck Massager.
to me it's a TENS Neck Massager. Nothing moves and it electrically stimulates the nerves.

bought : TEMU .. Jan24 .. £11.50 / $14.60
model : JT-008

1st impression :
imho a Neck TENS massager is probably the best 'relaxer e-device' you can get.
The neck seems key imho.
Easy to use and no fuss (e.g. pads, wires)
Best expectation/impact ratio (1 being best).
Seen variations of it (e.g. 3 big pads in the middle, 2 pads)

On TEMU I've seen 2 pad versions for like under £10.
I suspect even cheap ones have a good 'joy' factor.
Not enough to get knots out in 1 go, but more joy than other devices.
Don't know if expensive ones are better (e.g. more power ? ) but even cheap give some joy.

Price now £23 on TEMU :
2 weeks after purchase its went from £11 to £23.
Don't know how TEMU set their prices.
Suspect they go up and down all the time.