1. Low power supply-5VDC low voltage input 2. LAN control-even if WiFi cannot access the Internet, the device can be turned on or off 3. App support - free iOS and Android mobile app 4. Remote on or off - turn on or off electrical equipment anytime, anywhere 5. Sync status-real-time device status provided to the application Timing-Set the schedule or countdown to turn on or off at the specified time Shared control-control your smart home with your family Scene-One key to turn on or off a bunch of devices Smart scene-trigger on or off by temperature, or other environmental conditions of the sensor Compatibility-for Alexa, for Assistant, for IFTTT, for Nest perfect match colour: green and black Material: PCB size: 34.5x25x19mm Package Contents: 5 x DC relay module Only the above package content, other products are not included. Note: Light 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.