brand new and high quality Features: The receiver adopts relay, which can load high-power electrical appliances to ensure long-term stability control. Adopts RF technology ,it can pass through walls, floors and doors, control receiver from any place within a reliable distance. A remote controller can control multiple switches,or multiple remote controllers can control a switch.Easy to operate, flexible and arbitrary combination. Stable and reliable performance, high receive sensitivity. Mainly used in industrial control,security fields, such as light, motor, remote controller, wireless security alarm, wireless door alarm, wireless controller and so on. 4CH Remote Controller only, other accessories demo in the picture is not included! Specification: Material: ABS Dimensions: app.74x53x28mm / 2.91x2.09x1.10in Operating frequency: 315 MHz / 433 MHz Operating Voltage:DC12V / DC24V Maximum load: 10A Controllable number of channels:4 Modulation:AKS Quantity: 1 Set Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x 4CH Remote Controller-315MHZ / 433MHZ 1 x HYD-4 Switchs