I need 5 vrooms to get where I want to be. I find that only the Wahl Classic and the Hitachi really get to a 5. The old (now discontinued from Eden, but it can be purchased elsewhere) Nasstoys Ultimate Massager, a Pocket Rocket
, gets close, but it's more of a 4.5. It's about the only battery powered toy that gets that close. No other pocket rocket gets that strong. There was an other old toy, the Taffy Tickler, that ran on two C batteries. Damn, that was about a 4.8!
I have actually found the rechargeable toys don't get strong enough for me.