Measurement Computing LogBook Series - Manual (Page 88)

5-12 LBK and other non-DBK Options 919495 LogBook User’s Manual
Remote Switch and LED Indicator - Specifications
Momentary Contact Switch: >5mA (DC or AC); push-button style recommended
Resistor: 1K ohm, rated at > 0.125 W
LED: <50 mA, operating voltage <3 VDC