Sadly, Neca's correct...a lot of the automated ones rely on a ring of beads that presumably move up and down over a sheath with the penis in it...unfortunately most of these beads are either too far away to provide consistent sensation or the mechanism jams easily.
Fleshlight enthusiasts swear by placing the hard case of the fleshlight between a mattress and box spring and using it hands-free that way, mimicking thrusting into a real partner. You should give that a try!
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