Size:RGBW LED controller set It is can control the RGBW led strip lights, change the color, dim/brighten the lights, warm/cool white , different programs. Different receivers can work synchronously even when started at different times (but should be within 30 meters) Compatible with WiFi. But If you want to control RGBW strips by smartphone, you need purchase the WiFi controller (ASIN: B00N9VAOG2). Receiver: Working voltage: DC 12V/24V Max load per channel: 6A/channel Max standby power: 0.5W Output connection: Common Anode(+) Control distance: 30 meters Remote Control: Working voltage: 3V How to link or unlink: Link: Press Key "OK" once within 3 seconds after switching it on. The link is done once the white light blinks. Unlink: Long press Key "ON" once within 3 seconds after switching it on. The unlink is done once the white light blinks.