Press on each of the eight message cells for a clear audible message. Select one of six, eight or twelve message sets (or levels). This gives a choice of either forty-eight, sixty-four or ninety-six messages. Messages can be recorded and then will last 100 years without battery back-up or can be changed again in seconds. Tech/Talk is an extremely robust device but its light-weight and carry strap make it very portable. Good battery life with 4 AA batteries.