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Davtron Deluxe Digital Chronometer M877 Davtron Model 877 Deluxe Digital Chronometers provides Greenwich mean time, local time, flight time recorder,The Davtron M877 digital clock is draining the No. This Service Bulletin gives the instructions and data necessary to change the power supply. Dallas Avionics provides M877 Series Digital Chronometer|Davtron. M877R-28V-24, Remote display for M877-28V Series Serial time data output for remote use. ▫ Flight time alarm with external output. ▫ Elapsed time count down timer with alarm. ▫ Temperature - Compensated Davtron M877 Features: 2-1/4" INTERNAL MOUNT; TWO BUTTON CONTROL SYSTEM; GREENWICH MEAN TIME; LOCAL TIME; FLIGHT TIME WITH ALARM; ELAPSED TIME COUNTER WITH Davtron M877 Features: 2-1/4" INTERNAL MOUNT; TWO BUTTON CONTROL SYSTEM; GREENWICH MEAN TIME; LOCAL TIME; FLIGHT TIME WITH ALARM; ELAPSED TIME COUNTER WITH AUDIO ALARM FOR MODELS 800, 803, 850 & 877 To Pin 6 of M877 & M850. To Pin 7 of M877 & M850 *Must order Model 850 & 877 with M800R for remote option.