About the package, there are two kinds and we will send it randomly . the package is like following pictures: Photocell sensor for automatic door and gate 1.Indoor 15m, Outdoor 10m 2.12-24 VDC/AC 3.waterproof 4.Anti-sunlight Infrared Frequancy : 1.92khz Power supply : 12 to 24 VDC /AC Wave length :940nm Input : r*15ma - t*30ma operating temperature : -20 degrees to 180degrees Relay output : 1 a max *36 v Range : range can be reduced to 30% in bad weather conditions : for rain ,dust ,etc Single beam photocell sensor/single beam detector is used for automatic slide door, coil door , garage door windows etc. Consists of a transmitter and a receiver, and the integrated amplifier can produce infrared beam. Narrow infrared beam (I or II) can avoid interruption by external light. Even installed at low height(20-40cm from the floor), the detecting distance can also be guaranteed(5-15meters). The beam produced by MICROCELL provides a self-detecting function for the sliding doors. Once the self-detecting beam is interrupted, the door will stop closing and reverse rapidly to the utmost width. The door will open until the detecting beam is resumed. When the door completely closes, the detecting beam becomes invalid