The second addition to the innovative cordless Hero family. The HERO 60 is variable from 30,000-60,000 BTU and features Quiet Burner Technology (QBT) yielding 50% quieter noise output. The internally rechargeable battery runs up to 8 hours on a single charge and can also run while plugged in and charging. One battery included; the second sold separately. The perfect heater for hard to reach location off the grid!