The new VM112 Mini Vortex Mixer is a first of its kind featuring a rechargeable battery with a 2 hour continuous operation time. LED lights light up during operation and also display battery level. The mixer comes with touch function and has excellent mixing capabilities and a super sturdy design which holds the Vortex Mixer firmly in place during mixing. The mixer has a fixed speed of 5600RPM. Portability is a great capability of this mixer. Perfect for mixing small vials and test tubes.