The RFD4031 comes with a standard rubber foot on the bottom of the sled. An optional locking foot that is used in place of the standard locking foot and secures the battery of the sled is available as a purchasable accessory. For a full list of accessories that can be used with the RFD4031 RFID Premium sled, refer to the product specific Technical Accessory Guide available at: zebra.com/support.
