Attach the Laser Diffuser to the Beam Receiver when using the Laser transmitter. The diffuser will make aiming the transmitter/sensor much easier. It also contains a 650nm bandpass filter to keep sunlight out of the receiver.
To attach: remove terminal adapter from the front of the Beam Receiver and replace with the Laser Diffuser.
Because this includes a band-pass filter it should not be used on the receiver when using an infrared transmitter (it will block the infrared light).