・ Desktop receiver and three transmitters are offered as a set. ・ Both the three transmitters and the desktop receiver have been tested and confirmed to be working. ・ Instruction manual included (copy). ・ The three transmitters can transmit three items, making it convenient to convey three different requests. Note 1) Before use, insert two AAA batteries into the three transmitters. (See the instruction manual) Note 2) The three transmitters were used in a stationary position. A wall holder was available, so I will include it. When using the holder, remove the rubber feet from the back of the transmitter.