When we first saw this product on its own it sort of looked like an adult toy, but it's meant to rock your baby's world, not yours. The product and website are German so we can't provide all the details, but the concept is fascinating. The small device attaches to your stroller or crib and somehow rocks it side to side. The only English description we could find says it "noiselessly rocks the pram with sideways movements" which we presume to mean it vibrates.
We know many sleep experts discourage using motion to put and keep babies asleep, but in our experience motion was one of the only strategies for putting our baby to sleep and he outgrew the need after a few months.
We saw the Lolaloo on Kids Modern and have been perusing the official website which has several videos of the Lolaloo in action. Below is a video of it attached to a crib (there also seem to be special bottoms you add to the crib legs):
What do you think - genius? silly?