With wireless technology, underground wiring that connects the two poles on opposite side of the road can be omitted. As a result, installation could conveniently be done with ease. In areas where electricity is difficult to access, a solar powered version of the product is also available. Available for purchase: 1. Set of 2 poles, one on each side of the road 2. Set of 4 poles, one on each side of the road and traffic island.