Internal AC charger recharges battery pack quickly after discharge Multiple battery packs may be daisychained together for unlimited runtime AC and circuit breaker LEDs display status of AC charger and battery pack breaker Rotating front panel to match orientation for horizontal/rack, tower or wallmount units Stand for a tower configuration as well as fittings for a 19-inch rack 23-inch rack and wallmount kits -optional- Three-year parts and labor warranty