Abstract: A firing method for a set of electronic detonators includes receipt, by a receiving device associated with one or more electronic detonators, of an ignition command from a transmitted sequence of ignition commands including at least two ignition commands, a synchronisation delay being associated with each ignition command. A counting down, from the time of receipt of the ignition command, of the synchronisation delay associated with the received ignition command, and a counting down of an ignition delay associated with each electronic detonator from a synchronisation time corresponding to the time at which the countdown of the synchronisation delay is complete, are carried out. Each electronic detonator is ignited once the countdown of the ignition delay is complete. An electronic detonator includes a reception device, first and second countdown devices and a firing device.