Controller is either timed or random, set to 1,3,5,or 10 mins. There is also a remote that pauses the timer or has a button for instant release. It works by popping a balloon in the tube.
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Photo: My new toy, great with an inflatable sofa undernea9/6/20report
On here last year, the seller has deleted his account though. Only made 10 as they took a while. I am glad I got the remote as my GF is terrified of it!