The Model 091-195-12 is a power supply with a load-transfer relay. Inputs are the +12 volts from the vehicle's battery and 120 volts A/C shore power. An mobile data terminal or computer may be connected to the output terminal. When shore power is applied, a well-regulated switching power supply converts the 120 VAC to +12 VDC and a relay transfers the load from the battery to the power supply. This battery saver provides low-ripple D/C power to ensure no interference while powering sensitive electronic equipment.