This product is a wireless remote control key, remote control equipment such as rolling shutter door and garage door within 50m-100m(free space). Bring you a remote control experience, bring more convenience to your . NOTE: Please that your receiver function is working properly before purchasing, because this product needs to be matched with your receiver first. Disclaimer: Your remote control must be consistent with the picture described by us, and your remote control and model must be in the compatibility list of the store. Frequency:433mhz Code:Rolling code Buttons:4 Battery:Include Battery Distance:50m-100m Scope of application:garage door, alarm, automatic door, rolling door, etc Weight:0.081(kg) Size:6.8x4.0x0.9(cm) Colour:Black Material:ABS Package Contents: 3 x Remote Control 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.