LOW BATTERY: Battery status signal LED.

SERIAL1: 6-pole Amphenol connector for serial input/output

START STOP LAP INPUTS: 6-pole Amphenol connector for START, STOP, and LAP signals

FUSE: Fuse cavity

SPEAKER: Jack connector for external speaker connection

START STOP: Green START STOP button used for manual START and STOP signals and for modifying values in program settings

LAP RESET: Yellow LAP RESET button used for manual LAP signals and for confirming program settings

POWER: On/Off switch

SUPPLY: Neutrik connector for external power supply and battery charging (if used)

USB: USB cable connector for firmware updating