The RTX901D is a 1 channel transmitter and receiver designed to transmit and receive for KNOP's 901 series products.
The receiver has a relay output as well as an on/off switchable buzzer.
The RTX901D has an external input on either the RJ45 or Mini-Jack connector which can activate the transmitter.
The product can be powered either via the internal batteries (2 x 1.5V AA alkaline) or the micro-USB or RJ45 connector.
Cables, power adapters, and other external equipment are not included.