Like the 12V DC relays, 12VDC relays are used in RVs and trailers, as well as in consumer electronics. They include SPST and SPDT contacts which have gold plating to ensure an electrical resistance lower than 100mΩ. This figure is important for the continuity of voltage in circuits that employ very small amounts of energy. Some versions have magnetic latching, reducing the amount of energy needed to keep the device in standby mode. This feature is useful for IoT sensors and solar charge controllers that are low on battery power.