I’ve got a couple of these - https://amzn.eu/d/al9UtxR - and they are brilliant. So powerful. Rechargeable. Sit anywhere. Not too big to carry around. I sat in a restaurant a couple of weeks ago (at 37C) with it sat on the table. I could see people eyeing it with longing. I only paid £10 for mine though. I notice the price has tripled.