Orion Dew Zapper, 35 inches long. Was used on a Celestron 9.25 SCT. 12 volt 20 watts (works out to about a 2 amp draw). 10 foot power cord with "cigarette lighter" plug.
Asking $25 shipped in USA (international, $22 USD plus actual postage).
Paypal, MO, personal check (only from excellent rated AMers)