The Spectra Precision® Laser LL300-4 is your medium-range, high-accuracy solution. Ideal for basic slope work such as driveways and ramps, checking or leveling elevations, concrete forms, footings and foundations for small- and medium-sized jobs, and for excavations, digging footings and septic tanks. The LL300-4 includes rechargeable Ni-Cd batteries and battery charger. Ni-Cd batteries boast a 100-hr. battery life for less down time in the field.