Davtron 811B24A digital clock chronometer with gray faceplate. 14 volts. It can display the time in the 24 hour format. Tested working on power supply. A switch or two seemed a little stiff, may just need some lubricant. Not sure how to test if battery is good. If battery needs replaced, Aircraftspruce sells it for $33. These units sell new for over $500, and I am listing it for half that much with a 30-day return policy.