The protective rubber boot gives your SellBooksFast Laser Barcode Scanner added protection by wrapping the entire scanner in rubber. With holes for the scan aperture, charging port and lanyard loop, you pull it on like a glove. Not unlike the soft rubber phone cases we all know and love, the protective rubber boot not only provides impact resistance, it allows a firmer grip of your UnionNet SP2100 Laser Barcode Scanner under all circumstances.