Ideal for bulldozers, front end loaders and backhoes, 360 degree window for receiving a red beam rotary laser signal, Ideal for clamping or magnetically mounting on machinery, Bright LED display signal the direction of the laser beam, This unit can be used with a 12 or 24 volt battery or with rechargeable batteries that are included, 40-6791 Includes > Detector with clamps and powerful magnets, NiMH rechargeable battery pack, cable, charger, instruction manual with warranty card, hard-shell carrying case