An expendable remote initiator receiver for initiating at least one shock tube connectable to an explosive charge, wherein the receiver includes: (i) a shock tube interface adapted to interface directly with the shock tube connected to an explosive charge, (ii) a spark initiator for initiating a spark at the shock tube interface in order to initiate the shock tube, (iii) receiver means for receiving a coded signal from a transmitter, (iv) input means for inputting operational commands into the receiver for generating an output signal for the initiation of the shock tube upon receipt of a valid transmitted coded signal, (v) dual processing means that are independent of each other to provide independent control of a firing circuit and the processing means are adapted to synchronise with each processing means before initiation can occur so as to enhance safety and reliability of the receiver and the initiation thereof, (vi) configuring means adapted to allow the receiver to be field bondable such that the receiver can be configured to any transmitter, (vii) zeroising means adapted by configured software to allow the configuration of the receiver to be blanked so that the receiver cannot be initiated by any transmitter until such time as the receiver is field-bonded by the configuring means, (viii) LCD display icons to display battery levels, RF signal, group number and timer initiated firing, (ix) a keypad to allow inputting of commands into the receiver, and (x) a power supply to provide power to the receiver, the remote initiator receiver being characterised in that it further includes: (xi) multifunctional shock tube interface adaptor mounted and connected to the shock tube interface, the multifunctional shock tube interface adaptor is adapted to connect the ground of a printed circuit assembly to a needle nut assembly to allow a spark to occur upon initiation by the spark initiator and holds the PCA securely, (xii) a multifunctional battery cap adapted to withstand ±25KV electrical static discharge events and to allow for the receiver to stand upright, and (xiii) antenna capable of withstanding ±25KV ESD events, wherein the spark initiator includes the needle nut assembly connectable to the multifunctional shock tube interface adaptor, the needle nut assembly having a needle nut, a needle and a high voltage capacity medium to ensure the high voltage is carried to the tip of the needle via said medium for the creation of the spark required for initiation. (i) a shock tube interface adapted to interface directly with the shock tube connected to an explosive charge, (ii) a spark initiator for initiating a spark at the shock tube interface in order to initiate the shock tube, (iii) receiver means for receiving a coded signal from a transmitter, (iv) input means for inputting operational commands into the receiver for generating an output signal for the initiation of the shock tube upon receipt of a valid transmitted coded signal, (v) dual processing means that are independent of each other to provide independent control of a firing circuit and the processing means are adapted to synchronise with each processing means before initiation can occur so as to enhance safety and reliability of the receiver and the initiation thereof, (vi) configuring means adapted to allow the receiver to be field bondable such that the receiver can be configured to any transmitter, (vii) zeroising means adapted by configured software to allow the configuration of the receiver to be blanked so that the receiver cannot be initiated by any transmitter until such time as the receiver is field-bonded by the configuring means, (viii) LCD display icons to display battery levels, RF signal, group number and timer initiated firing, (ix) a keypad to allow inputting of commands into the receiver, and (x) a power supply to provide power to the receiver, the remote initiator receiver being characterised in that it further includes: (xi) multifunctional shock tube interface adaptor mounted and connected to the shock tube interface, the multifunctional shock tube interface adaptor is adapted to connect the ground of a printed circuit assembly to a needle nut assembly to allow a spark to occur upon initiation by the spark initiator and holds the PCA securely, (xii) a multifunctional battery cap adapted to withstand ±25KV electrical static discharge events and to allow for the receiver to stand upright, and (xiii) antenna capable of withstanding ±25KV ESD events,