The PT660 code transponder is used in combination with the remote control systems for pumps from a tank, to serve the need of signal transmission in cases where long distances have to be covered or large physical obstacles (e.g. mountains) have to be overcome, ensuring the coupling. It is always placed in the highest possible position to ensure a reliable line of sight to the points of interest and is powered by mains voltage. Depending on the propagation conditions, it has a range of up to 15km (line of sight). Only the codes received at the transponder from the specific remote control system are retransmitted to the receiver.