ซินเซียร์ลี่ ยูนิตี้ ไวบ์

Five speeds is more than I expected for something this small, and the low setting is genuinely gentle. It's USB rechargeable so I'm not hunting for batteries, and the five-year warranty sealed it for me.

Tossed it in my purse and completely forgot it was there until I needed it — that's how small it is. The five speeds give a nice range from gentle warm-up to serious, and USB charging means no hunting for batteries.

Wasn't sure five speeds would actually feel different from each other, but they really do. Charges fast over USB and the battery holds up way longer than I expected.