The Dolgin Engineering TC-400 4-Position Charger for Canon VIXIA HF100, etc. is a 4-position microprocessor-based battery charger. It provides fast, safe simultaneous charging of 7.2V BP-827 batteries. This unit features a Digital LCD display indicating the battery pack charge in progress status and true capacity upon charge completion. Simultaneous Charging: This charger offers safe simultaneous charging of high capacity battery packs. All four batteries are ready in about 2.5- 3 hours. Worldwide Charging: A Worldwide 100-240 VAC Power supply works in most locations. With an optional cable (not included), 12V DC car power can be utilized when AC power is not available.