Small Dimmer for Drivers or Ballasts. Unidirectional and broadcasting communication. Control by conventional push-button, with or without memory:Short press: turn on /off light.Long press: dimming up/down. Dimming speed adjustable by rotary knob. for address setting 1. Address value = Left rotary switch value x 10 + right rotary switch value. For example : Left rotary switch value is 5, right rotary switch value is 4, Address value = 5 x 10 + 4 = 54. 2. Unicast mode : Address value 0-63 corresponds to addresses 00-63. Group mode : Address values 70-85 correspond to groupings 0-15. Broadcast mode : Left rotary switch value is 9. PUSH dimming speed setting 1. The closer the is to "+", the faster the PUSH dimming speed will be. 2. The closer the is to "-", the slower the PUSH dimming speed will be. Memory function setting Short press the "SET" button to switch the memory function. 1. Without memory: LED indicator is red, PUSH dimming and then power on again, light returns to maximum brightness. 2. With memory: LED indicator is green, PUSH dimming and then power on again, light restores the last brightness. Factory default: Without memory Push-button function Short press:Turn on / off light. Long press :Dimming up/down & Warnings DO NOT install with power applied to device. DO NOT expose the device to moisture. Colour:White Material:plastic Package Contents: 1 x LED Dimmer(Due to different product batches, the appearance , which does not affect the use) 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.