The 4 Zone LED Sync Dimmer and Receiver kit uses the most advanced 2.4GHZ RF wireless transmission technology. Sync an unlimited amount of 18 Amp Dimming LED Receivers to up to 4 different zones within the 100ft RF Control Signal radius to create amazing synchronized dimming effects in multiple locations. Easily control each zone individually, in groups, or all zones as one through the remote keypad. The controller comes with four brightness shortcut uptions, one scene saving buttons and brightness adjustments using advanced control technology to create smooth dimming with no flickering (Note: Lowest Dim level ≈ 10%). A unique circle touch pad enables a wide range of dimming control.and Night Mode Key. 4 number keys allow for 4 quick and easy zone control options with the ability to sync an unlimited amount of receivers to any zone. additional receivers sold separately.