How do I adjust the swing speed and turn it on and off?
Push the LOW button once for speed 1, twice for speed 2, or three times for speed 3. Push the HIGH button once for speed 4, twice for speed 5, or three times for speed 6. The indicator lights show which speed is activated—green lights indicate low range speeds and red lights indicate high range speeds. To turn the swing off, press and hold either speed button. You don't need to start at the lowest speed; the swing can begin directly at any desired speed. (Page 27)
From the official Graco Slim Fit Swing manual, page 27
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