On the Stomp it can be found on the chassis centre bar, just above the shopping basket on a black and white sticker.
On the Moon it can be found on the right hand side of the chassis as if you were standing behind the pram, just above the rear wheel.
On the Eclipse it can be found under the plastic foot plate at the front of the pram.
On the Discovery stroller it can be found on the inner section of the rear frame, right hand side if standing behind it.
On the Globe it can be found on the right hand side of the chassis as if you were standing behind the pram, near the cup holder latch.
On the Gravity it can be found in the back of the footrest at the front of the stroller.
On any of our car seats, it can be found on the back of the seat on the outside of the hard plastic shell, its a white sticker, not red one.