Remote control or connected with external push switch to achieve on/off and dimming function Ultra sensitive brightness adjustment Contact slide Smooth dimming and switch without any flickering Auto-transmitting function: Controller automaticly transmit signal to another controller with 30m control distance Synchronize on multiple number of controllers.Magnet on the back which can be easily stuck on back holder or any metal surfaces Match Guide: The dimmer can match with all kinds of single or multiple zone 2.4G RF dimming remote controller. Choice 1: Use Match key 1. Match: Short press match key, within 5s, press on/off key of the remote. 2. Delete: Long press match key for 5s, delete all matched remote. Choice 2: Use Power-up 1. Match: Switch off the power, then switch on power again,short press on/off key 3 times on the remote quickly within 5s after power on, is done once the light blinks 3 times. 2. Delete: Switch off the power, then switch on power again,short press on/off key or zone key 5 times on the remote quickly within 5s after power on,the unlink is done once the light blinks 5 times. colour:white + black Material:plastic size:97x33x18mm Package Contents: 4 x V1 LED Dimmer 4 x R11 Remote 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.