There are a selection of speeds so you can find the one that works best on your particular mattress and soothes your baby the most effectively.
Modes 1-3 are static speeds from slow to faster. The slower speeds are often the most effective as low frequency vibrations travel further though the mattress – but experiment with your mattress and baby’s response.
Modes 4-6 are variable speeds which replicate the acceleration and deceleration of a car engine and the rumble of the tyres on the road.
Zed times out after one hour of use, after which a single press switches it back to the mode most recently used.