The old TR-6 Series had individual input voltages, 16 timing ranges from 0.1 seconds – 2 hours and a trigger voltage of 10V DC; the new TR-6 Series has a universal input voltage of 24-240V AC & 12-125V DC, 16 timing ranges from 0.05 seconds – 100 hours and a line voltage trigger (for more information on line voltage triggers, view this )