Viessmann 5801 2 Lev.Cross.Warn.Lights BlinkerN Andrew's crosses, 2 pieces with blinking electronics This set consists of 2 Andrew's crosses and a flashing electronic Art. 5065. Maintenance-free thanks to LED lighting. For automatic operation 6840 are additionally the electronic relay Art. 5552 and switching tracks or the switch contacts Art. Required. Height: 19 mm. TIP:. The sound module type 5556 generates the appropriate sounds.