As published in October 2006, as of 1 January 2007, the automatic progression of the weight of the barbell from the 1st attempt to the 2nd attempt is 2 kg (two kilogrammes)!
It applies both in snatch and in clean and jerk, for men and women, for seniors and juniors. For 3rd attempts lifters may take the 1kg progression or any weight, multiples of 1kg, as before.
Technical Rule 5.5.10: As of 1st January 2007, a request for changing the weight of the barbell must be announced within the first 30 seconds of the allocated time also if the athlete follows himself/herself, i.e. he/she has 2 minutes before starting the attempt.
Practically, when a competitor is taking consecutive attempts, the competitor/coach must declare their next attempt within the first 30 seconds after being called, even if it is the automatic increment. Failure to do so will forfeit the two changes allowed.
Accordingly, in the case of the 2 minutes allocated time, there will be audible signals (buzzer) two times: at 90 seconds and at 30 seconds.