IR is an infrared photoelectric tube unit, which integrates infrared emission and receiving tubes. IR remote control is widely used in consumer electronics, it can be used to operate devices such as a television set, DVD player, or other home appliance, from a short distance. Since this unit comes with emitter and receiver, you can practice not only on IR encode but also on IR decode. infrared emitter(wavelength:940nm) infrared receiver Distance range: Less than 5m Software Development Platform: for Arduino, for UIFlow(Blockly,Python) Two Lego-compatible holes Colour:White Material:plastic Cable color random, don't accept the specified color Due to different batches, there may be differences in product appearance and printed text, which will not affect use Package Contents: 1 x IR Unit 1 x Grove Cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.