Built in change mode, you can adjust by dialing code DMX512 address code can be set via DIP 3 relay outputs,5A per channel Working voltage: DC12V-24V Relay load: 5A per channel Controller: DMX512 3P D mx512 Data: 0-127 Relay Switch OFF,128-255 Relay Switch ON Size: 120 x 55 x 20mm color: blue material: plastic DIP10 function key (FUN). DIP10 (FUN) is OFF, as DMX512 mode, receive standard DMX512 signal. Occupies three address code, (R, G, B for each channel), DIP1-DIP9 address code setting. When less than 127 DMX512 data relay off DMX512 data is 127 when the relay is closed DIP10 (FUN) is ON, the built-in change mode and does not receive standard DMX512 signal. DIP1-DIP9 to invoke the built-in effects settings. Package Contents: 3 x Relay Switch 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.