EASY SMART HOME CONTROL FOR EVERYONE: Brilliant touchscreen panels with built-in Tuya Smart APP easy for everyone to control popular smart devices, lighting, locks, thermostats, scenes and more by simply. EASY TO REPLACE: You only need to connect the wires hidden in the wall to the dimmer. If you need, you can quickly connect your home theater speakers and fix them . The whole process only takes 15 minutes. TUYA LIGHTS & CONTROL: Now everyone can easily browse and with different speakers, control anywhere smart lights in your home, and unlock the door with a compatible -all without needing a phone. Relay version External interface description 1,TF card: read TF card interface. 2,TYPE-C USB: external USB, with conversion cable can read U disk; Upgrade. 3,Button: short the lock screen/light screen; and hold to power off/restart. 4,Upgrade key: Standby upgrade key port. 5,With speaker sound hole 6,Knob: to switch equipment. Rotate to adjust light brightness, curtains, air conditioning, volume, etc. 7,485: connected to 485A 485B through the external device to control the background music, you can also control other 485 devices through the machine. 8,Ethernet port: Supports wired network. 9,Disassembly mouth: disassemble the shell fixing screw pry open L Live line input N Neutral line input, L1 L2 is 2 for the switch control line respectively connect the corresponding light live line output (based on the actual host access) Color: As Shown Material: Aluminum PC Package Contents: 1*Tuya Panel Control 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.