I was looking for some handheld blenders to mix my drink in office and at home. So I did a research on all the portable blenders on Amazon.
Bellemain Professional Milk Frother 2-Speed Battery Operated Handheld Milk Frother
This one is a perfect milk forther, with 2 speed of 15,000 RPM for frothing and whipping, 13,000 RPM for blending. It uses 2 AA batteries. 2 Year Warranty.
Milk Frother Handheld, Travel Coffee Frother Milk Streamer Foam Maker Drink Mixer
So far this is my favorite choice. I can just put it in my bag, and use it at the gym, in the office or at home to mix my protein drinks.
If you are looking for a multifunction blender, I think it is a good one. It has 12 speeds, BPA free, and a 304 STAINLESS STEEL BLADE.