The Zebra RFD40 Premium Plus Sled is the sled version of Zebra's RFID reader — rather than an integrated gun-grip handheld, it's a sled attachment designed to clip onto and extend a compatible mobile computer or smartphone with UHF RFID reading capability, using a standard-range circular polarized antenna and Zebra's SE4100 imager for 1D/2D barcode scanning alongside RFID. This form factor suits operations that already carry a mobile computer or rugged phone and want to add RFID capability to it, rather than issuing a separate dedicated RFID gun. It includes Bluetooth and WiFi connectivity and a 7000mAh battery for extended-shift use, matching the Premium Plus gun-grip model's core specification in a different physical format.