You're right Paul ,it was the Savage QC Ranger Pendulum.
http://www.savagearchery.com/
It seems to work the same way as the savage , by calibrating it to the speed of your bow. The one pin works like a pendulum while the other 3 are fixed at preset yardage.(you set)
The QC(Quick Click)Ranger works on Bow Speed, Set on 20yds as a Pendulum or if shooting on the ground just click in the yardage your shooting at out to 70 yds also.