Proteco safety photocells are designed to protect entrance-ways and gate openings by detecting the presence of an object when it block the light-beam that is transmitted between the two units. Photocells use invisible infra-red light, with a transmitter and receiver sensor aligned together on either side of the entrance. Proteco offer a variety of safety photocells including standard surface mounted wired photocells, flush (recessed/rebated) mounted wired photocells and wireless photocells.