The photocell ROUND is the result of several year of research in the field of automatic openings of doors and gates and is particularly suitable for the control of transit and for protection. It is constructed in compliance of the norms with two independent relays. It is fed with a voltage range between 10 and 30Vac/Vcc. Its simple and rational design, always with the high productive quality of PROGET, makes this photocell the best on the market.