Effortless Installation: The mini relay receiver allows for easy installation without requiring extensive modifications. Due to different batches, there may be differences in product appearance and printed text, which not affect use Colour:White Material:PC Package Contents: 4 x Relays 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.