Vortex Mixer Stainless Steel Shaker Bottle Li-ion USB Rechargeable PORTABLE PROTEIN SHAKE MIXER - The only portable vortex shaker mixer you will ever need on the go. USB RECHARGEABLE - Save hundreds of dollars with the Lithium-Ion rechargeable battery. ONE TWIST LOCK LID - The easy one twist lock mechanism gives the lid a tight seal for no leaks. DETACHABLE MOTOR BASE - The motor is easily removable for safe and easy cleaning. BPA-FREE - Made with transparent bpa-free acrylic with capacity of 16oz/450mL plus stainless steel