Working voltage: 9V-30V Frequency: 300MHz - 868MHz. Distance: 30-50 meters. One receiver can work with 400 codes. It does not interfere with other remote controls and receivers. Color: as shown Material: metal + PVC Package Contents: 4 x Receiver 4 x English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.