Answer: electriceye

AnswerCrossword Clue
ELECTRICEYE

Surveillance tool

ELECTRICEYE

Garage door gadget

ELECTRICEYE

Automatic door device

ELECTRICEYE
Photocell
ELECTRICEYE
Door-controlling sensor
ELECTRICEYESensor of a sort
ELECTRICEYEMagic door opener.
ELECTRICEYEOne sensitive to light
ELECTRICEYESensor
ELECTRICEYEOne might set off an alarm