My parents' has a software-controlled knob. The speed that you turn it matters. Fast turns increment by 30 seconds (and I think goes to larger increments when y

My parents' has a software-controlled knob. The speed that you turn it matters. Fast turns increment by 30 seconds (and I think goes to larger increments when you pass 5 minutes), slow turns increment by 5 seconds. It's a fairly pleasant interface to use.