The 2 removable receivers are needed only on Alterrain / Alterrain Pro.
Never jog with an infant car seat attached; the store page lists 'From Birth with Infant Car Seat (walk only)'.
About this pair
The Clek Liing goes on the BOB Alterrain Pro with the BOB Jogging stroller adapter for Nuna, Cybex and Maxi-Cosi seats (model S12046000), about $99.99. With the carrier on, you are pushing about 41.3 lb (32.3 lb stroller, 9 lb carrier). The seat itself is rated up to 30 lb and up to 32 in, per Clek.
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14 other infant seats fit the BOB Alterrain Pro.
Summary from the makers' published data.
How to set up the Clek Liing on the BOB Alterrain Pro
What you need
The BOB Alterrain Pro
The Clek Liing carrier (its car base stays in the car)
The BOB Jogging stroller adapter for Nuna, Cybex and Maxi-Cosi seats (model S12046000)
Step by step
1Set the parking brake and rotate the canopy toward the handlebar.
2If the stroller has no built-in receivers, push the included R and L receivers onto the yellow pins behind the seat fabric until they click and green bars show.
3Push both end caps of the adapter straight into the receiver sockets until each side clicks, then pull the front tube to check it is locked.
4Recline the stroller seat and set the car seat on the adapter rear-facing and centered, lining up the car seat's side hooks with the receivers.
5Push the car seat straight down until both sides click.
6Lift up on each side of the car seat to check it is secure.
