This dew heater fits my guide sope perfectly, after finally finding one small enough, but let me take a minute to complain about the astronomical community. Dew Heaters come with USB plugs, 5.5mm x 2.1 mm 12-volt plugs, and RCA plugs. This community should really settle on one design, and I would suggest the one that other industries use for 12 volt power.The plug for this device was not detailed in the description … and it is the RCA plug type, that is often not compatable with our 12 volt power supplies like the ZWO ASI AIR.







