Features: Quality housing: Waterproof and corrosion resistant, photo electric sensor features long lasting and reliable quality assurance, ensure lighting time. Sufficient to use: You will get 3 pieces dusk to dawn eye sensors in black color, adequate and sufficient for daily using. Each measures about about 52.5 x 29 x 42 mm/ 2.1 x 1.1 x 1.7 inch, suitable size for easy installation. Also you can recommend them to people in need. Specifications: Size: about 52.5 x 29 x 42 mm/ 2.1 x 1.1 x 1.7 inch Sensor head length and diameter: about 0.8 x 0.6 inch/ 20 x 15 mm Main color: black Weight: 55 g Input voltage: 120-277 V Package includes: 3 x Photoelectric switches Warm notes: Remember that LEDs operate on DC power, other voltages are not suitable. Please allow a little error on the size due to manual measurement. The color might exist slight difference due to different displays. Please read the size instruction carefully before purchasing.