The DS1402-RP3 cable is a coiled cable used to connect iButtons® to 1-Wire® masters, such as the LinkUSB. The RP3 suffix indicates that this cable is 0.9 m (3 ft) long when uncoiled. One end of the cable can be used either as a momentary touch or a dwelled contact for an iButton®. The other end is a modular connector for the master.
For more information on this product please visit its data page here: DS1402-RP3 DataSheet.