It is somewhat similar to narrow-aisle straddle truck, except operator lifted with the load to allow for less-than-unit-load picking. Typically it has forks to allow the truck to be used for pallet stacking and to support a pallet during less-than-pallet-load picking. "Belly switch" is used for operator's safety during picking the materials. While reach trucks and turret trucks are used for storing and retrieving pallet loads, order pickers are used for handling individual items or cases. An order picker, also known as a stock picker or an order selector, lifts the operator on a platform along with the forks. The operator picks items from bulk storage locations and places them directly onto a pallet on the forks of the truck. Order pickers can safely move forward while in an elevated position. They can be completely operator-guided or can run on wire guidance systems.