Is this really safe??

So, the other day I looked over at Catherine after putting her into the "soothing vibrating seat" and this is what I saw...

She was determined to suck on the switch that turns the vibrations on and off. After I chuckled for awhile I started wondering if she is really safe in the seat anymore. he he (note: I do strap her in!)

She realized I caught her red-handed! he he