The BrandTech Scientific Accu-jet Pro Pipette Controller with 120v power supply. Features a long-life, environmentally-friendly Nickel-Metal hydride battery, with a special pulsed-mode charger to eliminate "lazy-battery effect". Instrument supplies approximately 8 hours of continuous pipetting (with a 10mL pipette) without recharging with an LED light indicating low battery. Contoured for better fit for small and large hands. Its light weight and well balanced for low-fatigue pipetting.