DC Supply: 9 to 33 V Continuous. Cranking Dropouts: Able to survive voltage dips during cranking. This is achieved without the need for internal batteries. Alternator Input Range: 15 - 305 V AC RMS Alternator Input Frequency: 50 - 60 Hz at rated engine speed. Magnetic Input Range: 0.5 V to +/- 80 V Magnetic Input Frequency:2300Hz to 6000 Hz at rated engine speed. Start Relay Output: 16 Amp DC at supply voltage. Run Relay Output: 16 Amp DC at supply voltage. Alarm Output: 1 Amp DC at supply voltage. Dimensions: 72 X 72 X 118.5 (Excluding Keyswitch) Operating Temperature Range: -30 to +70°C Installation: Front panel mounting via suitable cut-out. Retaining clips supplied. Cable connections via locking plug and socket type connectors. Calibration: Speed trip setting and meter calibration adjustment potentiometer are accessible from the rear of the module.