Orion 13.7V 4A AC-to-DC Power Adapter for GoTo Mounts Handy wall plug provides 13.7 volt power to GoTo Mounts for optimal operation Recommended for use with Orion Atlas EQ-G, Atlas Pro AZ/EQ-G, Sirius EQ-G, and Sirius Pro AZ/EQ-G GoTo mounts; and XTg GoTo Dobsonian telescopes Converts 120 volt household AC power to 13.7 volt DC power Sturdy adapter housing with cables measuring 62" in length Not recommended for use with Orion HDX110 EQ-G Mount