Name: wireless moduleControl interface: a total of 3 pins (GND, VCC, SIG), GND is the ground, VCC is the power supply, and SIG is the signal input pin.Infrared emission tube: can emit infrared signals with a wavelength of 940nm.Groove: It is convenient to manually adjust the direction of the infrared emitting tube.Positioning holes: 4 M2 screw positioning holes with a diameter of 2.2mm, which make the module easy to install and position and realize the combination between modulescolor:BlueMaterial:PCBPackage Contents:2 x ReceiverOnly the above package content, other products are not included.Note: Light shooting 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.