This IR Emitter #500998 works in conjunction with IR Sensor #500999.
These are used with product 500405, 500406, 500407, 500420 and 500450. They can also be used with other products, except the xbox that has a different frequency.
The IR Emitter and Sender are included with 500405. The sender is required if product #500406 (Transmitter) is purchased separately. The emitter is required with #500407 (Receiver).
Note: the IR Sensor supports 38KHz frequency. The Xbox remote uses 56KHz frequency.