Vicky B2, 180 Degree Photo Cells with Battery Operated transmitter. The Viky B2 is a pair of 180 degree photo safety beams. This means they can be mounted in-between two Piers looking directly at each other or on the internal or external face of the piers, this is possible due to the internal mechanism can be rotated 180 degrees to ensure alignment. The Viky B2 receiver can be powered by 12 to 24 Volts AC/DC, and the transmitter is powered by 2 x AA batteries. This means you are only required to run a cable to the receiver as the transmitter is wireless. Viky B2 External photo safety beams are compatible with any new or existing gate automation systems.