Item Condition - Decoder IC - Rolling Code Type of Programming - Programming with the receiver Open space means no interference. No walls, no doors, no trees or any other obstructions. Interference like garage door or brick wall can reduce remote control range significantly. Compatible with: for XT2 433 SLH LR for XT4 433 SLH LR Application Sliding gate remote control Auto gate remote control Sliding door remote control Rolling door remote control Colour:White Material:plastic Package Contents: 4 x Remote Control(Due to different product batches, the appearance , which does not affect the use) 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.