Star Trek Original Serries. Vintage ThinkGeek Star Trek TOS Electronic Door Chime Motion Sensor. Modeled directly after the iconic U. Enterprise wall communication panels, it features a built-in motion sensor to monitor your room’s threshold. You can set it to greet anyone crossing the doorway with two authentic sound modes: the classic starship door opening “whoosh” sound or the loud “Red Alert” klaxon siren. Franchise: Star Trek: The Original Series (TOS). Condition: Open Box. Sound Effects: Door Opening Whoosh / Red Alert Siren. Power: Requires 3x AA batteries (extras not included). The red panel, blue lens housing, and yellow grill are immaculate, no color fading. The battery compartment and terminal contacts are factory-clean with absolutely zero corrosion or usage marks. Tested briefly for functionality and works perfectly. (Please note: This listing is for the loose, pristine door chime unit only; original outer retail box is not included).